Which out of the four ports of 8051 needs a pull-up resistor for using it is as an input or an output port?

Which out of the four ports of 8051 needs a pull-up resistor for using

1.	Which out of the four ports of 8051 needs a pull-up resistor for using it is as an input or an output port?
A.	PORT 0
B.	PORT 1
C.	PORT 2
D.	PORT 3
Answer» B. PORT 1