Every network device contains a unique built in Media Access Control (MAC) address, which is...

The general format for writing MAC addresses is to use six group of two hexadecimal digits, each separated by hyphen (-). Another standard method is also used for writing MAC addresses as three groups of four hexadecimal digits separated by dots. Answer: C is incorrect. Binary numbers are not used to denote MAC address. Answer: D is incorrect. This is an example of IP address. Answer: B is incorrect. This is not a valid MAC address as there four groups of four hexadecimal digits exist.