Which of the following is a valid MAC address?

34-9A-86-1G-B3-24
83-5A-5B-0B-31-55-F1
255.255.255.0
C0-34-FF-15-01-8E
73-99-12-61-15
192-168-12-15

i think its c but i'm not

solution:

the right option is a

to adding   a new row to a table we   have to do process last table cell and pressing tab.

this is the process to add new row in the cell:

* to add a row below the cell, click insert below in the rows and columns group.

thus this is the required right answer.