Consider the following Javadoc description for a method named doubleUp.

/** Returns any numerical value multiplied by two

* @param any double value

* @return the value of the input double multiplied by 2

* Precondition: the parameter is a positive value

*/

What is the most likely method header for this method?

• public static double doubleUp(double x) {

• public static void doubleUp(double x) {

• public static double doubleUp(int x) {

• public static void doubleUp( ) {