Uhhhhhh i think the answer is 'c' :)
Answer:
D
Explanation:
The reason exactly why it would be D because since all of the parts are the same there in never going to be a reason for to to be a interchangeable part
Mandatory would be things that are needed to keep things running like schools or healthcare discretionary is like the military it’s not necessary
Answer: because nobody could get to it
Explanation:
