Which of the following statements is false?

a. The javac command can compile multiple classes at once; simply list the source-code filenames after the command with each filename separated by a comma from the next.
b. If the directory containing the app includes only one app’s files, you can compile all of its classes with the command javac *.java.
c. The asterisk (*) in javac *.java indicates that all files in the current directory ending with the filename extension “.java” should be compiled.
d. All of the above are true.

A