Various techniques have been proposed to curb cross-border drug smuggling into a country. The costs of implementing each strategy along a particularly rugged section of the border are indicated below. The table also includes a score that is compiled based on deterrence, interdiction, and apprehension, with a higher score indicating better performance. For a budget of $60 million, determine which techniques should be employed on the basis of a cost-effectiveness analysis.

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Cost, $ Millions Activity Score Tethered aerostats 3.8 Boots-on-the-ground 31.4 52 18.7 Fence 12 Motion sensors 9.8 8.3 Seismic sensors 5 Drones 12.1 26