单项选择题

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')

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