Assuming that string1 = "hello" and string2 = "hello world", which of the following returns 0?
a. strcmp(string1, string2);.
b. strcmp(string1, string2, 6);.
c. Strncmp(string1, string2, 5);.
d. strncmp(string1, string2, 6);.
c. Strncmp(string1, string2, 5);.
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