有如下程序段：

s = "Happy 2021/07"

ans = "": f = True: Max = ""

For i = 1 To Len(s)

    ch = Mid(s, i, 1)

    If ch >= "a" And ch <= "z" Then

        ans = ans + Chr(Asc(ch) - 32)

    ElseIf ch >= "0" And ch <= "9" Then

        f = False

    End If

    If Not f And ch > Max Then

        Max = ch: f = True

    End If

Next i

Label1.Caption = ans + Max

执行该段程序后，标签label1中显示的内容是 （     ）

A、Happy7

B、HAPPY0

C、HAPPY7

D、APPY7