What is the read/write complexity of the following program?

Question

int N = 0, M = 10;
for (int x = 0; x <= M; x++ ) {
writeToDisk(""something"");
for (int y = 0; y <= N; y++ ) {
Math.random();
}
}
a. O(M)
b. O(M*N)
c. O(N^2)
d. O(1)

Answer 1

a. O(M)