PortB pins (RB4 to RB7) supporting 'Interrupt on change' feature

Q.  When does it become feasible for portB pins (RB4 to RB7) to support its unique feature of 'interrupt on change'?
- Published on 16 Nov 15

a. By configuring all the pins (RB4-RB7) as inputs
b. By configuring all the pins (RB4-RB7) as outputs
c. By configuring any one of the pins as inputs
d. By configuring any one of the pins as outputs

ANSWER: By configuring all the pins (RB4-RB7) as inputs

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