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If A(3,2,3), B (1,4,6) and C (7,4,5) are...

If A(3,2,3), B (1,4,6) and C (7,4,5) are the three vertices of a parallelogram ABCD, then the angle between its diagonal through D and the side DC is

A

` cos ^(-1) ((16)/(sqrt(357)))`

B

`cos ^(-1) (5/(sqrt(126)))`

C

`cos ^(-1) (5/(sqrt(21)))`

D

`cos ^(-1) (2/(sqrt(357)))`

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A
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