What are the four classes of HP Business Desktop PCs?

A.
HP All-in-One series, HP Elite series, HP Pro series, and HP series

B.
HP LE series, HP LX series, HP SE series, and HP DX series

C.
HP Compaq series, HP Pro Compaq series, HP Compaq Envy series, and HP Compaq Extra
series

D.
HP Enterprise series, HP Compaq Enterprise series, HP Envy Compaq series, and HP
Enterprise Extra series

Explanation: