A 2-dimensional array of integers having 3 rows and 4 columns is allocated on the heap as diagrammed below (only m is on the stack): 0 1 2 3 10 11 12 13 | 20 | 21 | 22 | 23 The first row contains the values 0, 1, 2, 3; the second row 10, 11, 12, 13; and the third row 20, 21, 22, 23. Which of the three choices below can be used to access the element in m at row r and column c? 1.mr)(cl 2. (m ) 1 only 2 only both 1 and 2 1,2 and 3. both 1 and 3