Calculate the total time required to transfer a $9\mathrm{.}6$MB file in the following cases, assuming an RTT of $240$

$ms,$ a packet size of $0\mathrm{.}3MB,$ and an initial $5$ RTT of "handshaking" before data are sent. $(20$ points$)$

a$.$ The bandwidth is $4\mathrm{.}5Mbps,$ and data packets can be sent continuously.

b$.$ The bandwidth is $4\mathrm{.}5Mbps,$ but after we finish sending each data packet, we must wait two RTTs

before sending the next.

c$.$ The bandwidth is double, and after we finish sending each data packet, we must wait three RTTs

before sending the next.

d$.$ The bandwidth is double and the packet size is halved, and after we finish sending each data

packet, we must wait two RTTs before sending the next.