If unit vectors hati and hatj are at rig...

If unit vectors `hati and hatj` are at right angles to each other and `p=3hati+4hatj,q=5hati,4r=p+q and 2s=p-q`, then

A

`|r+ks|=|r-ks|` for all real k

B

r is perpendicular to s

C

`r+s` is perpendicular to r-s

D

`|r|=|s|=|p|=|q|`

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A, B, C

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