Which sequence of control messages is used in MACAW for a successful data transmission?

Select one:

a$.$

RTS $->$ CTS $->$ DATA $->$ NAK

b$.$ RTS $->$ DS $->$ DATA $->$ ACK

c$.$

RTS $->$ CTS $->$ DS $->$ DATA $->$ ACK

d$.$

RTS $->$ CTS $->$ DATA $->$ ACK