If lx+my+nz=p is equation of a plane in ...

If `lx+my+nz=p` is equation of a plane in normal form, then

A

(a) `l^2+m^2+n^2=1`

B

(b) l,m,n are direction cosines of normal to the plane

C

(c) `p gt 0`

D

(d) All above

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The correct Answer is:

D

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