If and if A is invertible, then which of the following is not true?

1.	If and if A is invertible, then which of the following is not true?
A.	\[\left\| A \right\|=\left\| B \right\|\]
B.	\[\left\| A \right\|=-\left\| B \right\|\]
C.	\[\left\| adj\,A \right\|=\left\| adj\,B \right\|\]
D.	A is invertible if and only if B is invertible
Answer» B. \[\left\| A \right\|=-\left\| B \right\|\]

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If and if A is invertible, then which of the following is not true?

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