Which of these is a TRUE statement for Website Marketing?

a$.$

All digital marketing operations revolve around a website.

b$.$

It's a powerful channel on its own, but it's also the medium for a number of online marketing initiatives.

c$.$

A website should clearly and concisely reflect a brand, product, or service. It must be quick, mobile$-$friendly, and simple to use.

d$.$

All of these