What should you create?

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You are developing and application to track customer sales.
You need to return the sum of orders that have been finalized, given a specified order identifier. This value will
be used in other Transact-SQL statements.
You need to create a database object.
What should you create?

A.
extended procedure

B.
CLR procedure

C.
user-defined procedure

D.
DML trigger

E.
scalar-valued function

F.
table-valued function

Explanation:
User-defined scalar functions return a single data value of the type defined in the RETURNS clause.
https://technet.microsoft.com/en-us/library/ms177499(v=sql.105).aspx