以下哪段代码实现了类装饰器？（）

A.function configurable(value: boolean) { return function (target: any, propertyKey: string, descriptor: PropertyDesc descriptor.configurable = value; }; }
B.function enumerable(value: boolean) { return function (target: any, propertyKey: string, descriptor: PropertyDescr descriptor.enumerable = value; }; }
C.function color(value: string) { return function (target) { } }
D.以上都不对