You want to apply an access list of 198 to an interface to filter traffic into the interface. Which command will achieve this?

The command ip access-group 198 in will apply access list 198 to the interface in which it is configured in the inbound direction. Option A is incorrect because it improperly includes the interface in the command. Option B is incorrect because 'ip access-list' is used to create/edit ACLs, not apply them. Option C is incorrect because 'ip access-class' is used for line access (VTY lines), not interface ACLs.