Disjunction is OR, written like a right side up ∨. The upside down V is conjunction, AND, written ∧.
Let's make the disjunction truth table.
A B A ∨ B
F F F
F T T
T F T
T T T
A or B is true when either A is true or B is true or both. It's false when they're both false. That's called inclusive OR.
Answer: C
Interestingly, in the original algebra created by Boole, he preferred exclusive OR, written A^B. A^B is false when both A and B are true, but otherwise like inclusive OR. When we do it this way, exclusive OR is like addition mod 2 and AND is multiplication mod 2, so the algebra of Boole was more like regular algebra than what we call Boolean algebra today.
