If the lines  x   -   2 1   =   y   -   3 1   =   z   -   4 -   p   a n d   x   -   1 p   =   y   -   4 2   =   z   -   5 1  are coplanar then : p = 

a)  ± 3               b) 0, -1              c)  ±  1            d) 0, -3

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