The only linear transformation that is both one-to-one and onto is the identity map. Which of the following is true about the identity map?
Options:
A. It is the only linear transformation that is one-to-one and onto
B. It is the only linear transformation that is not one-to-one and onto
C. It is one of many linear transformations that are one-to-one and onto
D. It is one of many linear transformations that are not one-to-one and onto