Consider the length$-4$ unit amplitude pulse x$[$n$]=$ u$[$n$]$ u$[$n $4].($a$)$ Compute and plot the $4-$point DFT X$[$k$]$ of the signal x$[$n$].($b$)$ Use the DFT interpolation formula to compute the DTFT X$($e j$)$ from the DFT X$[$k$].$ Sample this X$($e j$)$ over $0$ $2$ using $10$ equally spaced points to create X$10[$k$].$ Compute and plot the IDFT of X$10[$k$].$ Comment on your results.