SimpleAudioEngine类对底层各种声音处理库进行抽象封装。下列哪一个方法用于设置背景音乐的音量:
A.
void SimpleAudioEngine::stopBackgroundMusic(bool bReleaseData)
B.
void SimpleAudioEngine::rewindBackgroundMusic()
C.
void SimpleAudioEngine::setEffectsVolume(float volume)
D.
void SimpleAudioEngine::setBackgroundMusicVolume(float volume)