Which of the Following Relational Algebra Commands or Combination of Commands

question 19

Multiple Choice

Which of the following relational algebra commands or combination of commands is capable of retrieving one or more columns of a relation?

• A) Select.
• B) Project.
• C) Join.
• D) Select and Project.
• E) Select, Project, and Join.

---

Definitions:

Variable Costs

Costs that vary directly with the level of production or sales volume, such as raw materials and direct labor costs.

Fixed Costs

Costs that do not vary with the volume of output produced, such as rent, salaries, and insurance premiums.

High-low Method

A technique in cost accounting used to estimate fixed and variable costs given the highest and lowest levels of activity.

Variable Cost Per Unit

The cost that varies with each unit of product produced, directly tied to the production volume, such as materials and labor.