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Analyze the following code.

double sum = 0; for (double d = 0; d < 10; sum += sum + d) { d += 0.1; } A. The program has a syntax error because the adjustment statement is incorrect in the for loop. B. The program has a syntax error because the control variable in the for loop cannot be of the double type. C. The program compiles but does not stop because d would always be less than 10. D. The program compiles and runs fine.

In the external mergesort algorithm, how many buffers are needed to merge runs?

a) one b) two c) three d) four