Gating ratio of 1: 2: 4 is used to design the gating system

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Gating ratio of 1: 2: 4 is used to design the gating system for magnesium alloy casting. This gating ratio refers to the cross-section areas of the various gating elements as given below:
1. Down sprue
2. Runner
3. Ingates
The sequence of the above elements in the ratio 1: 2: 4 is

1. 1, 2 and 3
2. 1, 3 and 2
3. 2, 3 and 1
4. 3, 1 and 2

Correct Option: B

Spruce base: Runner: Ingates