In a three-tier architecture, user interface classes should not be concerned with how the data is manipulated by the business classes.

If the value in cell A1 is 5, B1 is 3, and C1 is 2, which of the following formulas will produce a result of 1?

A) =A1+(B1* C1 ) B) =A1/(B1+C1 ) C) =A1+B1+C1 D) =A1/B1 + C1

If you forget to put a closing quotation mark on a string, what kind of error will be raised?

a. a compile error b. a runtime error c. a logic error