Assume a square wave named X is approximated by its first $4$ frequency components; the resulting wave is named Y$.$ Assuming the fundamental frequency of Y is $2\mathrm{.}5$ MHz$,$ compute the following:

a$)$ the spectrum of Y

b$)$ the bandwidth of Y

c$)$ the data rate of Y

Q$1$:

Please provide your calculation steps $($when possible$)$ as well as the final answer.