Which of the followings are early changes of COVID-19 CT? A: Multiple small patches and interstitial changes, especially in the periphery of the lung. B: Multiple small patches and interstitial changes, especially in the inner region of the lung. C: Diffuse ground glass opacifications, especially in the periphery of the lung. D: Diffuse ground glass opacifications, especially in the inner region of the lung. E: Lung consolidation and pleural effusion.