MCSD.NET - 70-316 Exam Interview Question:

You execute a query on your external Oracle database named XYZSalesDate by using an
OleDbCommand object. The query uses the Average function to return a single value that
represents the average price of products in the inventory table. You want to optimize performance
when you execute this query.
To execute this query from your ADO.NET code, you need to use a method of the
OleDbCommand object. Which method should you use?
A. ExecuteNonQuery
B. ExecuteScalar
C. ToString
D. ExecuteReader