Which of the following is a reason that routing redistribution is necessary?

a. Two or more static protocols are used.
b. Redistribute dynamic routes.
c. Certain protocols not supported by devices.
d. All the above are reasons.

c. Certain protocols not supported by devices.
Explanation: Routing redistribution enables devices to use a route from a different protocol (for example, EIGRP on non-Cisco routers). You also use it to redistribute static routes and when two or more dynamic routing protocols are used on the network.