Identify each of the below scenarios to an appropriate network type $($PAN$,$

LAN, WAN, MAN$).$ Give reasons for your choice. $[5]$

a$.$ Alice is sending an audio file using WhatsApp from his mobile to his

friend who is sitting beside him in a coffee shop.

b$.$ In BRAC BANK Gulshan branch: IT department, employees are

exchanging files among them using their network.

c$.$ PCs in Ayesha Abed Library can communicate with PCs at BRAC Center

$($Both are on different networks$).$

d$.$ A number of convenient stores $($ex: Seven Eleven$)$ located in a city are

connected, so office staff can easily communicate with one another.