Of the following statements, which one is true?

a) If you have a AMD compatible motherboard, you can install a Celeron processor.

b) Replacing the CPU may not be the upgrade that is most cost effective or that has the strongest impact on your system.

c) As the size of the bus address increases, the amount of RAM the CPU can use decreases.

d) You can always put a new CPU into an older motherboard with no other changes as long as it fits the socket.