Final answer:
The must-carry rule requires cable companies to carry all local broadcast channels or pay a fee for carrying specific broadcast channels.
Step-by-step explanation:
The rule that requires a cable company to either carry all local broadcast channels or pay a fee for carrying specific broadcast channels is known as the must-carry rule. This rule is enforced by the Federal Communications Commission (FCC) in the United States. According to the must-carry rule, cable systems are required to carry local broadcast channels to ensure that viewers have access to important local news, emergency alerts, and other public interest programming.