To solve this question, the user needs to know about the Java Servlets API and its interface.
The correct answer is:
B. javax.servlet
Explanation:
All the servlets must implement the Servlet interface of the javax.servlet package. The javax.servlet package contains a number of interfaces and classes that define the contracts between a servlet class and the runtime environment provided for an instance of such a class by a conforming servlet container. The javax.servlet package provides the base classes for defining HTTP servlets. Thus option B is correct.
Option A is incorrect because there is no package named java.servlet.
Option C is incorrect because the option is incomplete and doesn't provide the package name.
Option D is incorrect because there is only one correct option, and that is option B.