Answer:
B. displaying a list of all available commands within the current mode*
D. determining which option, keyword, or argument is available for the entered command*
Explanation:
Cisco IOS are known for using Command line interface(CLI) that allows execution of certain commands
Cisco system make use devices such as router, switch and others. All these Commans comes with privileged levels that gives access to user that have privilege to access between level 0 and 15.
It should be noted that two functions that are provided to users by the context-sensitive help feature of the Cisco IOS CLI are ;
✓displaying a list of all available commands within the current mode
✓ determining which option, keyword, or argument is available for the
