The diagram shows the market for eye tests.
Which policy would enable the government to increase the number of eye tests from $O{Q_1}$ to $O{Q_2}$?

1 )
a maximum price of $O{P_3}$ per test
2 )
a minimum price of $O{P_2}$ per test
3 )
a subsidy paid to opticians of ${P_3}-{P_2}$ per test
a subsidy paid to opticians of ${P_3}-{P_1}$ per test
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