Correct way to enqueue styles and scripts for your plugin option pages

load-admin-scripts.php

// Load the scripts conditionally
        add_action( 'load-' . $menu_page, array($this, 'enqueue_scripts') );

/* This function is only called when our plugin's page loads! */
    public function enqueue_scripts(){
        add_action('admin_enqueue_scripts', array($this, 'load_admin_scripts') );
    }

/* Load Scripts only if necessary */    
    public function load_admin_scripts(){
    	
    	wp_register_script( 
    		'wcpe_scripts', 
    		plugins_url('/assets/js/wcpe_scripts.js', WCPE_FILE_PATH ),
    		array('jquery'), 
    		1.0,
    		true );
    	wp_register_style( 
    		'wcpe_scripts',
    		plugins_url('/assets/css/wcpe_style.css', WCPE_FILE_PATH ),
    		'',
    		'',
    		'ALL' );
    	wp_enqueue_style('wcpe_style' );
    	wp_enqueue_script('wcpe_scripts');
}