Assuming we have the following up() function in a migration. Complete the down() function to reverse the migration. (This is a table modification not a creation) * Run the migrations. * @return void */ public function up { Schema::table("books', function (Blueprint $table) { $table->string('isbn'); stable--string("author); }); } * Reverse the migrations. * @return void */ public function down() { Schema::table('books', function (Blueprint $table) { Stable-> ('isbn'); $table->dropColumn }); }