This virtual IP address is in the same subnet as the interface IP address, but it is a different IP address. The router then automatically creates the virtual MAC address. All the cooperating HSRP routers know these virtual addresses, but only the HSRP active router uses these addresses at any one point in time.

The virtual router is responsible for host communications such as an ARP

request for the host’s default gateway. Technically, this is served by the active router since it is hosting the virtual router. However, it is the virtual router’s IP address and MAC address that are used for outgoing packets.

The "preempt" command enables the HSRP router with the highest priority to immediately become the active router.

Answer B is correct and not A because question asks for non default AD => we use 5 as AD for static route and not 1 because default AD for static route is 1

EIGRP is sometimes referred to as a hybrid routing protocol because it has characteristics of both distance-vector and link-state protocols. For example, EIGRP doesn’t send link-state packets as OSPF does; instead, it sends traditional distance-vector updates containing information about networks plus the cost of reaching them from the perspective of the advertising router. And EIGRP has link-state characteristics as well—it synchronizes routing tables between neighbors at startup and then sends specific updates only when topology changes occur. This makes EIGRP suitable for very large networks. EIGRP has a maximum hop count of 255 (the default is set to 100).

Once an OSPF Router ID selection is done, it remains there even if you remove it or configure another OSPF Router ID. So the least disruptive way is to correct it using the command "clear ip ospf process".

show ip eigrp events

To display the Enhanced Interior Gateway Routing Protocol (EIGRP) event log, use the show ip eigrp events command in user EXEC or privileged EXEC mode.

Reference:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/command/ire-cr-book/ire-s1.html#wp3095206170

Not A: external EIGRP has a standard AD of 170

B: could be correct “10.0.0.0 /8 is variable subnetted … 20 masks”

C: could be correct: There are 10 routes which use 0/2/0.100 or 0/1/0.100 interface

Not D: 10.0.0.0/8 was learned by BGP

A IPv6 Unique Local Address is an IPv6 address in the block FC00::/7. It is the approximate IPv6 counterpart of the IPv4 private address. It is not routable on the global Internet.

Note: In the past, Site-local addresses (FEC0::/10) are equivalent to private IP addresses in IPv4 but now they are deprecated.

Link-local addresses only used for communications within the local subnet. It is usually created dynamically using a link-local prefix of FE80::/10 and a 64-bit interface identifier (based on 48-bit MAC address).