The class ThreeD has a three-dimensional array of strings as one of its data fields. Define a method for the class that searches this array for the string passed to it as an argument. If the given...

The class ThreeD has a three-dimensional array of strings as one of its data fields. Define a method for the class that searches this array for the string passed to it as an argument. If the given string exists in the array, the method should return an array containing the three indices of the array element that contains the string. If the given string is not found in the array, the method should return null.