Consider the following multi-threaded C code. 1: /* Waits until bar ->n threads have called barrier 2: *before allowing any thread to continue 3: */ 4: void barrier (barrier_t * bar ) { 5: lock (& bar -> mutex); 6: bar -> count ++; 7: if (bar> count == bar ->n) { 8: bar -> count = 0; // reset barrier 9: cond_signal (& bar ->cv); 10: unlock (& bar -> mutex); 11: return; 12:] 13: while (bar -> count < bar ->n) { 14: cond wait (& bar ->cv, &bar -> mutex); 15: } Identify all bugs, if any exist. A. Lines 5, 10, and 16 B. Line 9 C. Lines 9 and 13 D. Line 13 E. No bugs

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