Final answer:
To manually exit a case in a switch/case statement, the correct command to use is the C) Break command. This ensures that after executing a matched case, the control is transferred out of the switch statement to prevent 'fall through'.
Step-by-step explanation:
In the context of a switch/case statement, when you want to exit a case and prevent the execution from falling through to the subsequent cases, you use the C) Break command.
Once the condition matches a case, the commands within that case will execute until a break statement is encountered, which then transfers control out of the switch statement. If a break is not present, the program will continue executing the next cases regardless of whether they match the condition or not, commonly referred to as 'fall through'.