Assume StringBuilder strBuf is "ABCDEFG", after invoking _________, strBuf contains "ABCRRRRDEFG".

a. strBuf.insert(1, "RRRR")
b. strBuf.insert(2, "RRRR")
c. strBuf.insert(3, "RRRR")
d. strBuf.insert(4, "RRRR")

c. strBuf.insert(3, "RRRR")

Computer Science & Information Technology

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