The diagram shows the market supply and demand curves for a particular agricultural product. The government allows the market price paid by consumers to be freely determined by demand and supply, but guarantees producers a price of $O{P_2}$.
Which area in the diagram represents the total subsidy payments made by the government to producers?

1 )
w + y + z
2 )
y + z
3 )
x
x + y +z
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