Which description of a smurf attack is true?

A.
A smurf attack is an attack in which small TCP packets are sent toward a server from
thousands of subscribers, which causes the server network buffer to overflow and drop
packets and results in a denial of service.

B.
A smurf attack is an attack in which the attacker sends ICMP echo request packets using
a spoofed source IP address destined to remote network broadcast addresses, which results
in all recipients replying back to the spoofed source IP address in an attempt to cause a
denial of service to the targeted spoofed IP address.

C.
A smurf attack is an attack in which the attacker sends UDP echo packets using a
spoofed source IP address destined to remote network broadcast addresses, which results
in all recipients replying back to the spoofed source IP address in an attempt to cause a
denial of service to the targeted spoofed IP address.

D.
A smurf attack is an attack in which the attacker attempts to change the TCP MSS value
to a small value for all TCP flows destined to the target device, which results in many small
packets having to be processed by the target, which causes buffer overflows and denial of
service.