What following command perform? "at 12pm Jul 31 ls date "
Execute "ls" and "date" command at 12pm on 31st July.
Execute "ls" and "date" command at 12pm on 31st July and mail output to owner of task.(User who had initiated that at command)
Execute "ls" and "date" command at 12pm on 31st July and mail output to root.
Execute "ls" and "date" command at 12pm on 31st July but no output.