The reason is in floor 4.
/d is a switch only available in cmd.
Microsoft Windows XP
(C) Copyright 1985-2001 Microsoft Corp.
C:\Test>cd /?
Displays the name of or changes the current directory.
CHDIR
CHDIR
CD
CD
.. Specifies that you want to change to the parent directory.
Type CD drive: to display the current directory in the specified drive.
Type CD without parameters to display the current drive and directory.
Use the /D switch to change current drive in addition to changing current
directory for a drive.