以下能正确定义数据类型SystemInfo的代码是( )。

A．Type SystemInfo
DiskDrives As String*10
Memory As Long
End Type
B．Type SystemInfo
DiskDrives As String*10
Memory As Long
End SystemInfo
C．Type SystemInfo
DiskDrives String*10
Memory Long
End Type SystemInfo
D．Typedef SystemInfo
DiskDnves String*10
MemoryLong
End Type