Java a) You are writing a method named getAverage that runs in the main class and is called by the main method. Its only parameter is a 2D double array named values, and it returns a double that is the average of all the values stored in it. Write the complete method header for this method. Include the opening brace for the method. b) Given a String variable named firstName that has been declared and initialized, write the complete statement needed to make firstName all lowercase.

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