Which command would you use to delete a specific ACL on the router?

To delete a specific Access Control List (ACL) on a router, the correct command is "no access-list number." This command effectively removes the specified ACL entry from the router's configuration. In Cisco IOS, the "no" command prefix is used to negate or remove a command that was previously configured. By using "no access-list number," you instruct the router to delete the ACL identified by that specific number from its running configuration.

This approach aligns with how other configurations are modified or removed within Cisco IOS. It is fundamental to understand that the command syntax is consistent across various configuration changes, making it easier for network professionals to manage and modify settings.

Other potential options may sound plausible, but they do not adhere to the established command syntax used in Cisco IOS for removing ACLs. Hence, they would not be effective for the intended action.