Is the Statement $\mathrm { H } _ { 0 } : = 9$

Is the statement $\mathrm { H } _ { 0 } : = 9$ a valid null hypothesis?

A) Yes, this is a statement that compares a parameter to a value
B) Yes, this is a statement that compares two parameters
C) No, equalities are not permitted in a null hypothesis
D) No, there is no parameter contained in this statement