- have all real diagonal elements
- must have all diagonal elements as 0 and rest as imaginary numbers
- must have all real elements
- must be a singular matrix

Answer: Option 3

Explanation:

All symmetric, skew-symmetric and orthogonal matrices must always have ONLY real elements.

Previous Question : A = 0 i
i 0
is a-

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See, as much as you want to hold on to the bitter sore memory that someone has left this world, you are still in it. And the very act of living is a tide: at first it seems to make no difference at all, and then one day you look down and see how much pain has eroded.

-Jodi Picoult
My Sister's Keeper