When Nmap performs a ping sweep, which of the following sets of requests does it send to the target device?

When Nmap performs a ping sweep, which of the following sets of requests does it send to the target device?

A.
ICMP ECHO_REQUEST & TCP SYN

B.
ICMP ECHO_REQUEST & TCP ACK

C.
ICMP ECHO_REPLY & TFP RST

D.
ICMP ECHO_REPLY & TCP FIN