$8.$ What the four functions of a switch?A$.$ Learns IP addresses, Forwards & filters packets, tracks inactivity, prevents layer $2$ loopsB. Learns MAC addresses, forwards & filters frames, tracks inactivity, prevents layer $3$ loopsC. Learns ports numbers, forwards & filters segments, tracks activity, prevents layer $1$ loopsD. Learns MAC addresses, forwards & filters frames, tracks inactivity, prevents layer $2$ loops