Multiply the Following $11 \cdot \frac{1}{11}$ A) $\frac{12}{11}$ B) $\frac{1}{22}$ C) $\frac{1}{121}$ D) $1$ E) $121$

Multiply the following. $11 \cdot \frac{1}{11}$

A) $\frac{12}{11}$
B) $\frac{1}{22}$
C) $\frac{1}{121}$
D) $1$
E) $121$