Find the Value or Values Of $c$ That Satisfy the Equation $\frac { f ( b ) - f ( a ) } { b - a } = f ^ { \prime } ( c )$

Multiple Choice

Find the value or values of $c$ that satisfy the equation $\frac { f ( b ) - f ( a ) } { b - a } = f ^ { \prime } ( c )$ in the conclusion of the Mean Value Theorem for the function and interval.
- $$f ( x ) = x + \frac { 18 } { x } , [ 2,9 ]$$

A) 2,9
B) $3 \sqrt { 2 }$
C) $0,3 \sqrt { 2 }$
D) $- 3 \sqrt { 2 } , 3 \sqrt { 2 }$