A programmer works freelance, building web pages and apps. As the programmer gains more clients and starts working on a business plan, what kind of e$-$commerce category better fits the freelancing business?

a$.$ Business$-$to$-$business $($B$2$B$)$

b$.$ Consumer$-$to$-$consumer $($C$2$C$)$

c$.$ Business$-$to$-$consumer $($B$2$C$)$

d$.$ Consumer$-$to$-$business $($C$2$B$)$