What is the primary difference between marketing and selling?

Select one:

a$.$

Marketing focuses on customer needs, while selling focuses on product features.

b$.$

Selling is a subset of marketing.

c$.$

Marketing is a long$-$term process, while selling is a short$-$term activity.

d$.$

Marketing is only applicable in business$-$to$-$business $($B$2$B$)$ contexts, while selling applies to both B$2$B and business$-$to$-$consumer $($B$2$C$)$ contexts.