$5$ Marks

Sketch the waveform

a$)$ at the B input of the NOR gate shown in Figure a$)$ below that will produce the output waveform B shown in Figure b$)$ for $x.$

b$)$ at the D input of the NAND gate shown in Figure a$)$ below that will product the output waveform $Y$ shown in Figure b$)$ for $Y.$

the NAND gate

B

$?$

Figure a$)$

Figure b$)$