Solve the Problem $f ( x ) = \log _ { a } x$

Multiple Choice

Solve the problem.
-Find a so that the graph of $f ( x ) = \log _ { a } x$ contains the point $( 4,10 )$ .

A) $\frac { 5 } { 2 }$
B) $\frac { 2 } { 5 }$
C) $\sqrt [ 10 ] { 4 }$
D) $\sqrt [ 4 ] { 10 }$