With a Monthly Standard Deviation of a Portfolio $\sigma$ _M, What Is the Annual Standard Deviation?
A)

Multiple Choice

With a monthly standard deviation of a portfolio, $\sigma$ _M., what is the annual standard deviation?

A) $\sigma _ { \mathrm { M } } \times 12$
B) $\sigma _ { M } \times \sqrt { 12 }$

C) $\sqrt { \sigma _ { \mathrm { M } } }\times 12$

D) $\sigma _ { \mathrm { M } } /\sqrt { 12 }$

E) $\sqrt { 12 } / \sigma _ { \mathrm { M } }$