Which two solutionsChoose the number of urban parks at which the marginal principle is satisfied? Number of parks Marginal benefit ($M) Marginal cost ($M) 3 $11 $3 4 $9 $5 5 $7 $7 6 $5 $9 7 $3 $11 Group of answer choices Three parks Seven parks Six parks Five parks Four parks below address the 'increase in time residents of major cities spend commuting to work' and 'car dependence and vulnerability to changes in costs associated with vehicle use'? Group of answer choices Improving public transport and rural development Self-sufficiency and self-containment Self-sufficiency and rural development Improving local footpaths and self-containment