During the U2000 dual-system installation and commissioning, the operations that can be performed by the ossuser user are?

During the U2000 dual-system installation and commissioning, the operations that can be performed by the ossuser user are?
A . When you forget the password or the password expires and you cannot log in to dbuser, you can log in to the operating system as the ossuser user, and use "#passwd dbuser" in the terminal to change the password
B. When the U2000License file is modified to the DOS format, you can log in as the ossuser user. B executes the dos2unix command to convert the U2000License file format from the DOS format to the UNX format.
C. Modify the password of the admin user who logs in to the vcs client
D. On the Solaris or SUSE Unix platform, if you cannot log in to the graphical desktop, you can log in as the ossuser user and use the command line to restore the binary mode database

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Answer: D