单选题 下列程序段的执行结果为______。
Dim A(4)
n=3
A(1)=1
For k=0 To n-1
For 1=1 To k+1
X=k+2-1
A(X)=A(X)+A(X-1)
If k＜n-1 Then Exit For
Print A(X);
Next 1
Next k