In Porter's value chain theory, $\_\_\_\_\_$ and $\_\_\_\_\_$ activities can be broken down into three types of sub$-$activity $-$ direct, indirect, and quality assurance.

Question $3$ options:

a$)$

primary; secondary

b$)$

secondary; value

c$)$

primary; support

d$)$

value; competitive advantage

e$)$

value; profit