When using Proteus software to control the visual field of the editing area, press keys F5(), F6(), F7(), F8(). (1) Reduce. (2) Amplify. (3) Display the whole drawing. (4) Display a graph centered on
A.(1), (2), (3), (4) B.(4), (2), (1), (3) C.(1), (3), (2), (4) D.(4), (1), (2), (3)