问题：
[单选题]根据《建筑工程建筑面积计算规范》(GB/T50353),关于室外楼梯的建筑面积计算的说法,正确的是( )。
A、有永久性顶盖的按自然层水平投影面积计算
B、无永久顶盖的按自然层水平面积的1/2计算
C、顶层无永久顶盖的室外楼梯各层均不计算建筑面积
D、无永久顶盖的上层楼梯不计算建筑面积
参考答案：
D
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