What should never be replaced in a/c system of a car? HELP!!?

QUIT CHEATING!! Don't plan on being a good tech if you can't learn theory of operation, and can't follow moral rules.
 
E. None of the above

I have replaced all of those components several times.

and quit cheating! LOL

Re-read question the suction part sounds fishy.
 
I'm curious to see what answers come in? Seems I recall my techs replaced all of the above at one time or another. Now we referred to the accumulator as just that or a receiver drier - Maybe D since the term Suction Accumulator does not feel right. The lines may have to be custom but that not a problem as most dealers have kits with all the couplings etc. you may need.
Where is the ? coming from - an exam?
 
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