What will be the difference of level between point C & D if the Backsight & Foresight at points C & D are 3.565 & 2.865 respectively?

1
Fall of 0.700 m from C to D
2
Rise of 1.700 m from C to D
3
Rise of 0.700 m from C to D
4
Fall of 1.700 m from C to D

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