A pulse is applied to each input of an exclusive-OR gate. One pulse goes HIGH at t = 0 and goes back LOW at t = 1 ms. The other pulse goes HIGH at t = 0.8 ms and goes back LOW at t = 3 ms. The output...

A pulse is applied to each input of an exclusive-OR gate. One pulse goes HIGH at t = 0 and goes back LOW at t = 1 ms. The other pulse goes HIGH at t = 0.8 ms and goes back LOW at t = 3 ms. The output pulse can be described as follows:
(a) It goes HIGH at t = 0 and back LOW at t = 3 ms.
(b) It goes HIGH at t = 0 and back LOW at t = 0.8 ms.
(c) It goes HIGH at t = 1 ms and back LOW at t = 3 ms.
(d) both answers (b) and (c)