How does a switch "learn" MAC addresses?
O
All the MAC addresses must be entered manually.
The switch comes loaded with the most frequently used addresses.
It reads the source address and keeps a record of which port the sending computer is on.
The switch uses a mathematical formula to determine what the MAC address would be for each
computer connected to it.

All the MAC addresses must be entered manually.

It reads the source address and keeps a record of which port the sending computer is on.

Explanation:

Switches can decipher the MAC address in two manners: dynamically and statically. And statically, we need to add each of the MAC addresses to the CAM table on our own or in precise manually. And dynamically, the switch can learn and finally add them to the CAM table on their own or in a nutshell automatically. This CAM table is archived in the memory. Also, a switch forms a MAC address table through the archiving of the MAC address of each of the devices that are connected to its ports. And it uses the information detailed in the MAC address for sending the frames to a certain device via the port, that is meant for that device. Hence, the above-mentioned options are correct.

b. xor is the correct answer