Encoded keys for scan lines with '1101' value (RB1 low) condition

Q.  Which keys are encoded for scan lines with '1101' value (RB1 low) condition?
- Published on 12 Nov 15

a. 0, 4, 8, C
b. 1, 5, 9, D
c. 2, 6, A, E
d. 3, 7, B, F

ANSWER: 2, 6, A, E

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