下面代码执行后的输出结果为（ ）？
const student = {name: 'ZhangSan'}
Object.defineProperty(student, 'age', {value: 22})
console.log(student)
console.log(Object.keys(student))
A{name: 'ZhangSan'}
['name','age']
B{name: 'ZhangSan',age: 22}
['name']
C{name: 'cb'}
['name','age']
D{name: 'ZhangSan'}
['age']