Can a $1 \times 1$ Matrix be any of these following type?

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I have some questions regarding $1 \times 1$ matrix as there was so much confusion on the $1 \times 1$ matrix. I just wanted to be sure.
They all are true/false questions basically.

Can a 1X1 Matrix be –

• Row Matrix?
• Column Matrix?
• Square Matrix?
• Diagonal Matrix?
• Scalar Matrix?
• Identity Matrix?
• Null Matrix?
• Upper Triangular Matrix?
• Lower Triangular Matrix?
• Symmetric Matrix?
• Skew Symmetric Matrix?

Answers:

Answer 1

• All $1 \times 1$ matrices are square, diagonal, scalar, upper triangular, lower triangular, and symmetric.

• The only $1 \times 1$ matrix which is an identity matrix is $[1]$ .

• The only $1 \times 1$ matrix which is either skew-symmetric or null is $[0]$.