In binary heaps, the grandparent of a node in index i (assuming this node has a depth of at least 2) is located at index: Select one:

a. None of the above

b. floor(i/2)

c. floor(i/4)

d. 2i

In binary heaps, the grandparent of a node in index i (assuming this node has a depth of at least 2) is located at index: Select one:

a. None of the above

b. floor(i/2)

c. floor(i/4)

d. 2i