D. UMNA. UMN = UNM. B. UMN = - UNM. C. UMN =UNM1= − . UNM

1

. D. U

MN

A. U

MN

= U

NM

. B. U

MN

= - U

NM

. C. U

MN

=

U

NM

1

=

.