code: protected static int getNumOfNonExperimentalOptions(Class<?> clz) {
          Field[] options = getAllOptions(clz);
          int count = 0;
          for (Field option : options) {
              count += option.getName().startsWith("X_") ? 0 : 1;
          }
          return count;
      }
docs: Returns the number of non experimental options for the given class.
  
  @param clz
  class that defines options.
  
  @return number of non experimental options defined in the given class.