In the U2000 dual-system installation and commissioning, what operations can be performed by the ossuser user?

In the U2000 dual-system installation and commissioning, what operations can be performed by the ossuser user?
A . When the dbuser cannot be logged in due to forgotten password or password expiration, you can make the ossuser user log in to the operating system and use the "#passwd dbuser" method to modify the password
B . When the U2000 License file is modified to DOS format, you can use the ossuser user to log in and execute the dos2unix command to convert the U2000 License file format from DOS format to UNIX format.
C . Modify the password of the admin user who logs in to the VCS client
D . On the Solaris or SUSE Unux platform, if you cannot log in to the graphical desktop, you can use the ossuser user to log in and restore the binary mode database by using the command line.

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Answer: D