Select the correct answer or fill up the...

Select the correct answer or fill up the blanks in each of the following questions :1. The line x = ay + b, z = cy + d and x = a'y + b', z = c'y + d' are perpendicular if(a) aa' + cc' = 1 (6) aa' + cc' =-1 (c) bb' + dd' = 1 (d) bb' + dd' =- 1.

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