What is a characteristic of the .300 AAC Blackout cartridge in relation to the .223 Remington cartridge?

A. It has a smaller rim diameter and requires a new firearm to be used
B. It has a larger rim diameter and requires a new firearm to be used
C. It has the same rim diameter and only requires a barrel change to be used in a firearm that was previously using .223 Remington
D. It has a different bullet type and requires a new magazine to be used
Answer: 