Two lines in 3-D are x=ay+b,z=cy+d and x...

Two lines in 3-D are `x=ay+b`,`z=cy+d` and `x=a^'z+b'`,`y=c'x+d'` are perpendicular to each other then which of the following condition is true? (a) `aa'+c+c'=0` (b) `c c'+a+a'=0` (c) `aa'+c c'=0` (d) `a a'+c c'+1=0`

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