Which Package Is Automatically Imported by the Java System

question 21

Multiple Choice

Which package is automatically imported by the Java system?

• A) java.io
• B) java.lang
• C) java.util
• D) java.swing

---

Definitions:

Perfectly Competitive Industry

A Perfectly Competitive Industry is characterized by many sellers and buyers, free entry and exit, and a product that is identical across suppliers, leading to no single entity having market control.

Marginal Cost

The additional cost of producing one extra unit of a good or service.

Total Revenue

The total amount of money a company receives from selling its goods or services before any expenses are subtracted.

Profit-Maximizing Output

The point of production where a company reaches its maximum profit, occurring when marginal revenue is equal to marginal cost.