Sample Questions: Java SE 5 and 6, Certified Associate (1Z0-850)

Option A is incorrect because the java.awt package contains GUI-related classes.
Option B is correct because the classes for TCP and UDP communication are contained in the java.net package.
Option C is incorrect because the java.util package contains utility classes, such as the Collections API.
Option D is incorrect because the javax.swing package contains GUI-related classes.