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A 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 bar

3. Ingates

The correct sequence of the above elements in the ratio 1 : 2 : 4 is:

A) 1, 2 and 3                     

B) 1, 3 and 2

C) 2, 3 and 1                     

D) 3, 1 and 2