题目:单选题 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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