The line xcosalpha +ysinalpha=p will be ...

The line `xcosalpha +ysinalpha=p` will be a tangent to the circle `x^2+y^2-2axcosalpha-2aysinalpha=0` if `p=`

A

0 or a

B

0

C

`2a`

D

0 or `2a`

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