How to Enable Apache 2.4 Prefork->Event MPM in LAMP Stack

LAMP Stack 5.4.14-0 (64-bit) - Apache 2.4.4(Default mpm-prefork)

$ vi /opt/bitnami/apache2/conf/bitnami/httpd.conf

<IfModule mpm_prefork_module> <--disable
                    :
                    :
                    v
    <IfModule mpm_event_module> 
        ...
        ...
    </IfModule>

$ /opt/bitnami/ctlscript.sh restart apache

$ apacheclt -V

        :
    Server MPM : Prefork (Did not change)