Which parameter indicates the first column in the common extension example?

Which parameter indicates the first column in the common extension example?

• A. PAF2
• B. PAF1
• C. Constant
• D. Operator

Answer: (B)

In a common extension example, the position of a column is marked by a parameter that encodes its index. The one that indicates the first column is the parameter labeled to denote position one, which is PAF1. So PAF1 is the marker for the first column. PAF2 would correspond to the second column, not the first. A Constant represents a fixed value used in calculations, and an Operator defines an action to perform—neither serves to identify which column is being referred to.

In a common extension example, the position of a column is marked by a parameter that encodes its index. The one that indicates the first column is the parameter labeled to denote position one, which is PAF1. So PAF1 is the marker for the first column. PAF2 would correspond to the second column, not the first. A Constant represents a fixed value used in calculations, and an Operator defines an action to perform—neither serves to identify which column is being referred to.