When you connect an external monitor to your portable computer, the same image appears on both monitors.<br /> You need to drag a window from one monitor to the other.<br /> What should you do?()<br /> <img src="https://nimg.ppkao.com/2018-07/gelingxia/2018073115513959477.jpg?sign=2b039570789b8e149c22e292da7d216b&t=62d034ab" />
A、A
B、B
C、C
D、D