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Which of the folloiwng conditions such t...

Which of the folloiwng conditions such that the line `(x-p)/l=(y-q)/m=(z-r)/n` lies on the plane `Ax+By+Cz+D=0` is/are correct?
1. `lp+mq+nr+D=0`
2. `Ap+Bq+Cr+D=0`
3. `Al+Bm+Cn=0`
Select the correct answer using the codes given
(A) 1 only
(B) 1 and 2
(C) 1 and 3
(D) 2 and 3

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