若有以下程序，当程序运行后，单击命令按钮，则输出的结果为( )。 Private Sub Command1_Click() Dim a%(1 To 4), b%(3 To 6), i%, s1#, s2# For i= 1 To 4 a(i) = i Next i For i=3 To 6 b(i) = i Next i s1 = Factorial (A) s2 = Factorial (B) Print "s1="; s1; "s2="; s2 End Sub Function Factorial(a() As Integer) Dim t#, i% t=1 For i = LBound(A) To UBound(A) t = t * a(i) Next i Factorial = t End Function