Which annotation is used to specify a custom error page in a Java web application?

What is the purpose of the `@WebServlet` annotation in a Java web application?

A. To declare a servlet and its mapping

B. To define JavaBean properties

C. To execute SQL queries

D. To create JavaBeans

In a Java web application, what is the role of the `ServletContext` object?

A. It creates JavaBeans

B. It executes SQL queries

C. It defines JavaBean properties

D. It provides access to application-wide information and resources

What is the primary purpose of the `@PostConstruct` annotation in Java EE applications?

A. To define JavaBean properties

B. To execute SQL queries

C. To specify a method to be executed after an instance is created and its dependencies are injected

D. To create JavaBeans

In Java EE applications, what is the purpose of the `@Resource` annotation?

A. To execute SQL queries

B. To specify a resource to be injected into a component

C. To create JavaBeans

D. None of These