To understand why we need to have a minimum frame size Ttrans $=2\backslash$times Tprop in a CSMA$/$CD network, assume we have a bus network with only two stations, A and B$,$ in which Ttrans $=40\backslash$mu s and Tprop $=25\backslash$mu s$.$ Station A starts sending a frame at time t $=0\mathrm{.}0\backslash$mu s$,$ and station B starts sending a frame at t $=23\mathrm{.}0\backslash$mu s$.$ Answer the following questions:

a$)$ Do frames collide?

b$)$ If the answer to part a is yes, does station A detect collision before finishing transmission? Hint: determine when A will receive the jamming signal $($collision$),$ and compare with A$\text{'}$s transmission time.