For a transistor used as a switch, td is delay time, tr is rise time, ts is storage time and tf is fall time. Then turn-on time tON and turn-off time tOFF are respectively

For a transistor used as a switch, td is delay time, tr is rise time,

1.	For a transistor used as a switch, td is delay time, tr is rise time, ts is storage time and tf is fall time. Then turn-on time tON and turn-off time tOFF are respectively
A.	(td + ts) and (tr + tf)
B.	(td + tf) and (ts + tr)
C.	(tr + ts) and (td + tf)
D.	(td + tr) and (ts + tf)
Answer» E.