What is the major distinguishing factor between a $-$sT and a $-$sS scan?

The $-$sT scan includes both TCP and UDP ports, and the $-$sS scan does not

The $-$sS scan combines the $-$sT and a traceroute

The $-$sS scan does not complete the three$-$way TCP connection handshake

The $-$sT scan does not complete the three$-$way TCP connection handshake