Which of the Following Are Relevant in a Make or Buy

Multiple Choice

Which of the following are relevant in a make or buy decision?
$\text {\underline{ Prime costs} }$         $\text {\underline{ Sunk costs} }$               $\text {\underline{ Incremental costs} }$

A) yes yes yes
B) yes no yes
C) yes no no
D) no no yes