If you declare an array as int [, ] anArray = new int [5, 3]; you can double the value stored in anArray[2, 1] with the statement:

a. anArray[2, 1] = anArray[5, 1] * 2;

b. anArray = anArray * 2;

c. anArray[2, 1] *= anArray[2, 1] * 2;

d. anArray[2, 1] *= 2;

e. none of the above