Final answer:
Group functions can always be used in an inline view, which is treated as a table or view in an SQL SELECT statement. Functions like COUNT, SUM, AVG, MIN, and MAX are all applicable within inline views.
Step-by-step explanation:
The question you're asking pertains to SQL and how group functions are used in combination with inline views. An inline view is a subquery in the FROM clause of a SELECT statement that is treated as though it is a table or view. Group functions, such as COUNT, SUM, AVG, MIN, and MAX, can indeed be used within an inline view. So the answer to the question 'A group function can be used in a(n) inline view.' is A) Always. This is because all group functions are designed to work with multiple rows and compute a single result from a group of rows, which is exactly what an inline view may present.