__________ sends out a message to all other computers indicating it is going to send out data.

A.
CSMA/CD

B.
CSMA/CA

C.
CSMA/HB

D.
PPP

E.
SLIP

Explanation:

CSMA/CA sends out a message to all other computers indicating it is going to send out data.
CSMA/CA or token ring networking uses this approach to reduce the amount of data collisions.