Solve the Problem $\mathrm { f } ( 1 )$ Be Changed to Remove the Discontinuity

Multiple Choice

Solve the problem.
-To what new value should $\mathrm { f } ( 1 )$ be changed to remove the discontinuity?
$f ( x ) = \left\{ \begin{array} { l l } x ^ { 2 } + 5 , & x < 1 \\4 , & x = 1 \\x + 5 , & x > 1\end{array} \right.$

A) 6
B) 5
C) 7
D) 4