Which two functions are provided to users by the context$-$sensitive help feature of the Cisco IOS CLI? $($Choose two.$)$a$)$ providing an error message when a wrong command is submittedb$)$ displaying a list of all available commands within the current modec$)$ allowing the user to complete the remainder of an abbreviated command with the TAB keyd$)$ determining which option, keyword, or argument is available for the entered commande$)$ selecting the best command to accomplish a task