Explanation/Reference:
Explanation:
How to Disable Programs From Using Executable Stacks
Purpose: Prevent executable stack from overflowing.
You must be in the root role.
Edit the /etc/system file, and add the following line:
set noexec_user_stack=1
Reboot the system.
# reboot

The ipadm delete-addr subcommand removes addresses from interfaces.
To remove an address from the IPMP group,type the following command:
# ipadm delete-addr addrobj
The addrobj uses the naming convention inder-interface/user-string.

Explanation/Reference:
Explanation:
From the content of the /etc/shadow file we get:
* username: jack
* encrypted password: $5$9JFrt54$7JdwmO.F11Zt/ jFeeOhDmnw93LG7Gwd3Nd/cwCcNWFFg
* Last password change (lastchanged): Days since Jan 1, 1970 that password was last changed: 0
* Minimum: The minimum number of days required between password changes i.e. the number of days left before the user is allowed to change his/her password: 15
Maximum: The maximum number of days the password is valid (after that user is forced to change his/her password): 30 Warn : The number of days before password is to expire that user is warned that his/her password must be changed: 3
* Inactive : The number of days after password expires that account is disabled
* Expire : days since Jan 1, 1970 that account is disabled i.e. an absolute date specifying when the login may no longer be used

Set the EDITOR variable to vi.
Commands like `crontab -e` will use ed per default. If you'd like to use some better editor (like vi)
you can use the environment variable EDITOR:
# EDITOR=vi; crontab -e
will open the users crontab in vi. Of course you can set this variable permanently.
Incorrect answers
C: -e Edits a copy of the current user's crontab file, or creates an empty file to edit if crontab does not exist. When editing is complete, the file is installed as the user's crontab file. If a username is given, the specified user's crontab file is edited, rather than the current user's crontab file; this can only be done by a user with the solaris.jobs.admin authorization. The environment variable EDITOR determines which editor is invoked with the -e option. The default editor is ed(1). All crontab jobs should be submitted using crontab. Do not add jobs by just editing the crontab file, because cron is not aware of changes made this way.
Reference: Setting the default editor