$($II$)$ In the commonly used "ASCII" code, numbers, letters and other symbols are stored as $8-$digit binary numbers. The code for the letter A is $00100001,$ and the next letters are just the next binary numbers. $($a$)$ What binary numbers are used to store $C$ and $T?($b$)$ What would be the decimal numbers for ASCII B and H$?($c$)$ Using the format shown in Fig. $23-22,$ sketch the waveform of the letters that spell CAT.

A digital signal: This sequence would represent $10011001$ or $153$