a) How would the shell implemented in ushl.c behave when the user gives an invalid command (i.e. a command for which no executable exists)? (5 points) b) What would happen if the user gives multiple invalid commands? (5 points) c) What happens when the user tries to quit the shell after giving multiple invalid commands. (5 points) You can assume that the makeargv0 function (see its code at http://us sp.cs.utsa.edu usp programs chapterll/makea rgv.c) makes tokens out of the string passed as 1st argument (using delimiters passed in 2nd argument) and stores these tokens in the array pointed to by the 3rd argument. a) How would the shell implemented in ushl.c behave when the user gives an invalid command (i.e. a command for which no executable exists)? (5 points) b) What would happen if the user gives multiple invalid commands? (5 points) c) What happens when the user tries to quit the shell after giving multiple invalid commands. (5 points) You can assume that the makeargv0 function (see its code at http://us sp.cs.utsa.edu usp programs chapterll/makea rgv.c) makes tokens out of the string passed as 1st argument (using delimiters passed in 2nd argument) and stores these tokens in the array pointed to by the 3rd argument