To use one single function for stand-alone WordPress install and Multisite (in case options are network wide). Get/Update/Delete options with the same function with no need to check whether it's Multisite every time

wordpress_multisite_compatible_site_options_actions.php

//Check if plugin is Network activated
if (!function_exists('is_plugin_active_for_network'))	require_once( ABSPATH . '/wp-admin/includes/plugin.php');
    $plugins = get_plugins();
	foreach( $plugins as $plugin_file => $plugin_info ) {
		if ( $plugin_info['TextDomain'] === $this->plugin_name ){ 
			$plugin = $plugin_file;
			break;
		}
	}	
//And set constant
if (is_plugin_active_for_network($plugin)) {
	define("THIS_PLUGIN_NETWORK_ACTIVATED", true);
} 
else {
	define("THIS_PLUGIN_NETWORK_ACTIVATED", false);
}
// Instead of 'get_option' (regular WordPress) and 'get_site_option' (Multisite)
function get_this_plugin_option($option_name) {
	if ('THIS_PLUGIN_NETWORK_ACTIVATED' == true) {
        //Use Multisite function
	    return get_site_option($option_name);
	}
	else { 
	    //Use regular WordPress function
		return get_option($option_name);
	} 
}

// Instead of 'update_option' (regular WordPress) and 'update_site_option' (Multisite)
function update_this_plugin_option($option_name, $option_value) {
    if ('THIS_PLUGIN_NETWORK_ACTIVATED' == true) {
	    return update_site_option($option_name, $option_value);
	}
	else {
		return update_option($option_name, $option_value);
	}
}
// Instead of 'delete_option' (regular WordPress) and 'delete_site_option' (Multisite)
function delete_this_plugin_option($option_name) {
    if ('THIS_PLUGIN_NETWORK_ACTIVATED' == true) {
		return delete_site_option($option_name);
	}
	else {
	    return delete_option($option_name);
	}
}