Assume the speed of light is $2$x$10^8$ m$/$s$,$ and that the processing and queuing delays are negligible. Node A sends a $1500-$byte frame to node C through node B$.$Suppose Node A starts sending the first bit of the frame at t$=0.$ Answer the following questions:

a$.$ At what time $($t$=?)$ node B receives the frame in full $($i$.$e$.$ the last bit$)?$

b$.$ After node B receives the frame in full, then it will start sending the frame to node C$.$ Determine the time $($t$=?)$ when node C receives the frame in full.

c$.$ Suppose at this time node C sends a small acknowledgment back to node A$.$ The transmission time for the acknowledgment is negligible. Calculate at what times $($t$=?)$ the acknowledgment arrives at nodes B and A$.$

d$.$ Assume after sending its frame, node A wait for the acknowledgment back from node C before sending the next frame. What is the average throughput $($number of transmitted bits per second$)$ of the data flow from node A to node C$?$