A two-dimensional array element incorrectly referenced as a[x, y] is actually evaluated as

In the Java coordinate system, the point (0, 0) is ________.

a. The lower-right corner of the screen. b. The upper-right corner of the screen. c. The lower-left corner of the screen. d. The upper-left corner of the screen.

Collectors static method groupingBy with one argument receives a Function that classifies objects in the stream—the values returned by this function are used as the keys in a Map. The corresponding values, by default, are ________ containing the stream elements in a given category.

a. Lists b. Arrays c. Strings d. Collectors