Question

a ______ is a value that signals when the end of a list of values has been reached.
terminal
sentinel
token
delimiter

Explanation:

To solve this, we analyze each option:

• "Terminal" generally refers to an end point but not specifically for signaling end of a list of values in programming/ data context.
• "Sentinel" is a value used to signal the end of a list (or a sequence) of values, which fits the description.
• "Token" is a unit of a sequence (like in parsing) and not for signaling end of list.
• "Delimiter" is used to separate values, not signal end of list.

Answer:

B. sentinel