Q 1357123084.     The line `vec r=(4 hat i+2 hat j+ alpha hat k)+ lambda( hat i+ hat j+2 hat k)` lies on the plane `2x-4y+z=7` if `alpha=` ?

A

`7`

B

`0`

C

`1`

D

`-7`

HINT

A point on the given line is `(4,2, alpha)`

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