I agree with A+C
NSF Operation
Cisco NSF always runs with SSO and provides redundancy for Layer 3 traffic. NSF works with SSO to minimize the amount of time that a network is unavailable to its users following a switchover. The main purpose of NSF is to continue forwarding IP packets following a supervisor engine switchover.
https://www.cisco.com/en/US/docs/general/Test/dwerblo/broken_guide/nsfsso.html#wp1023627
SSO:This type of switchover ensures that Layer 2 traffic is not interrupted
NSF: Cisco NSF always runs with SSO and provides redundancy for Layer 3 traffic. NSF works with SSO to minimize the amount of time that a network is unavailable to its users following a switchover. The main purpose of NSF is to continue forwarding IP packets following a supervisor engine switchover.
in reality it is other way around. SSO uses NSF by default and it used for uninterrupted Layer 3 forwarding (SSO guarantees uninterrupted Layer 2 forwarding).
you will use NSR to Layer 3 forwarding be operational, because NSF kind of "enables" Layer 3 forwarding, but without NSR it won't work at all.
A & C - From Cisco:
[...] SSO also synchronizes critical state information between the RPs so that network state information is dynamically
maintained between RPs. <<<<<<<<<< A) IS CORRECT >>>>>>>>>>
SSO is generally used with Cisco nonstop forwarding (NSF). Cisco NSF enables forwarding of data packets
to continue along known routes while the routing protocol information is being restored following a switchover.
With NSF, users are less likely to experience service outages. <<<<<<<<<< C IS CORRECT >>>>>>>>>>
SOURCE: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15-sy/fhp-15-sy-book/fhp-hsrp-sso.pdf
AC
While SSO is happening, routing protocol communication between 2 supervisor stopped because lost of adjacency.
It and cause interuption, to avoid this we need NFS.
in order for NFS to work properly,
both supervisor must NFS.
To support uninterrupted Layer 2 operations in SSO , you have to use additional technologies like (VRRP) or (HSRP) can help to ensure that there is always a active router available to forward packets at the Layer 2 level
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