Which set of statements totals the values in two-dimensional int array items?

a.
int total = 0;

for (int subItems : items)
for (int item : subItems)
total += item;
b.
int total = 0;

for (int item: int[] subItems : items)
total += item;
c.
int total = 0;

for (int[] subItems : items)
for (int item : items)
total += item;
d.
int total = 0;

for (int[] subItems : items)
for (int item : subItems)
total += item;

d.
int total = 0;

for (int[] subItems : items)
for (int item : subItems)
total += item;