Answer:
The correct option of the following question is the Java applets may be contained in the files with .class extension.
Explanation:
JAVA is the Programming Language that can used to create the complete applications which may be run on the single computer or can be distributed among the servers and the clients in the network.
An applet is Internet-based programs that are written in the Java programming language, which is the programming language for Web and it can be downloaded by any of the computers. An applet is also run in the HTML. It is usually embedded in the HTML page on the Website and it can be executed from the browser.