Let A={X=(x, y, z)^(T): PX=0" and "x^(2)...

Let `A={X=(x, y, z)^(T): PX=0" and "x^(2)+y^(2)+z^(2)=1}`, where `P=[(1,2,1),(-2,3,-4),(1,9,-1)]`, then the set A:

A

Is a singleton

B

Is an empty set

C

Contains more than two elements

D

Contains exactly two elements

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The correct Answer is:

D

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