Study the PHP class named Module below: class Module$\{$ private $code,$name; public function $\_\_$construct$($$cod, $nam$)\{$ $this$->$code $=$ $cod; $this$->$name $=$ $nam;$\}$ public function getCode$()\{$ return $this$->$code;$\}$ public function getName$()\{$ return $this$->$name;$\}\}$ An object can be serialised by transforming its state into a format that can be saved so that it can be recreated later. $($a$)$ Explain what the state of an object Module means. $(2$ marks$)($b$)$ Describe the steps involved in saving the state of an object of Module in PHP$.(4$ marks$)($c$)$ Describe the steps involved in recreating objects from the format that it was saved in $($b$)$ in PHP$.(4$ marks$)($d$)$ List five PHP classes or methods that can be used for implementing $($b$)$ and $($c$).$ For each class or method, explain how it will be used. $(5$ marks$)$