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I : If OP = 21 and d.c.'s of vec(OP) are...

I : If OP = 21 and d.c.'s of `vec(OP)` are (2/7, 6/7, -3/7) then P = (6, 18, -9).
II : If P = (3, 4, -12) then d.c.'s of `vec(OP)` are (3/13, 4/13, -12/13)

A

Only I is true

B

only II is true

C

both I and II are true

D

neither I nor II are true

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