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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def link_page_is_suitable_for_display( self, request=None, current_site=None, menu_instance=None, original_menu_tag='' ):
 """ Like menu items, link pages linking to pages should only be included in menus when the target page is live and is itself configured to appear in menus. Returns a boolean indicating as much """

        if self.link_page:
            if(
                not self.link_page.show_in_menus or
                not self.link_page.live or
                self.link_page.expired
            ):
                return False
        return True