What is the computational complexity of the following code snippets?

a)

int sum = 0;

for (int i=0; i

for (int j=1; j

sum = sum+i*j

b)

int sum = 0

for (int i=0; i

for (int j=0; j

sum = sum+j;

c)

result = 0

for (i=0; i<10; i++)

for (j=0; j

result += i*j;