Synchronous TDM is used to combine $20$ digital sources of $256$ kbps$.$ Each output frame carries

$32$ bits from each source, and $8$ extra bits are added for synchronization.

a$.$ What is the size of an output frame in bits?

b$.$ What is the output frame rate?

c$.$ What is the duration of an output frame?

d$.$ What is the output data rate?