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

Explanation:
The default behavior of NMAP is to do both an ICMP ping sweep (the usual kind of ping) and a TCP port 80 ACK ping sweep. If an admin is logging these this will be fairly characteristic of NMAP.