Which of the following is the correct form of function definition in MATLAB?

Question $17$ options:

A$)$

$[$MaxValue$,$ Index$]=$ function GetMax$($x$)$

B$)$

cylinder $[$MaxValue$,$ Index$]=$ function $($x$)$

C$)$

function $[$MaxValue$,$ Index$]=$ GetMax$($x$)$

D$)$

function $($MaxValue$,$ Index$)=$ GetMax$[$x$]$