When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer mating in the （）
- A"slow" direction, just before the 12 o'clock position
- B"fast" direction, just after the 12 o'clock position
- C"fast" direction, just before the 12 o'clock position
- D"slow" direction, just after the 12 o'clock positio