const shape = { radius: 10, diameter() { return this.radius * 2 }, perimeter: () => 2 * Math.PI * this.radius}shape.diameter()shape.perimeter()A: 20 and 62.83185307179586
B: 20 and NaN
C: 20 and 63
D: NaN and 63
参考答案：
const shape = { radius: 10, diameter() { return this.radius * 2 }, perimeter: () => 2 * Math.PI * this.radius}shape.diameter()shape.perimeter()A: 20 and 62.83185307179586
B: 20 and NaN
C: 20 and 63
D: NaN and 63
参考答案：