已知视频组件的id名称为myVideo，以下哪句代码可以获取视频上下文？ A: this.videoCtx = wx.createCameraContext('myVideo') B: this.videoCtx = wx.createVideoContext('myVideo') C: this.videoCtx = wx.createAudioContext('myVideo') D: this.videoCtx = wx.getRecoderManager('myVideo')

已知有this.videoCtx为已经获取到的视频上下文,以下哪句可以用于播放视频? A: this.videoCtx.play() B: this.videoCtx.pause() C: this.videoCtx.sendDanmu() D: this.videoCtx.stop()