Which of the following features of slum upgrading make it an attractive option for policymakers? (Select all correct responses.) ing features of slum upgrading make it an attractive option for policymakers? (Select ) Slum upgrading provides badly needed infrastructure to slum areas, including water, sanitation, and solid waste disposal. These investments will plausibly improve health outcomes for slum residents (A (B) By encouraging slum dwellers to relocate outside of the city center, slum upgrades will enable slum dwellers to expand their employment opportunities. (C) Slum upgrading encourages densification of slum areas, leading to more formal housing, larger building heights, and higher land values. (D) Upgrading slums preserves their unique social structures, networks, and the fabric of slum com- munities, instead of uprooting slum dwellers and forcing them to move somewhere else. (B) Slum upgrading is environmentally friendly and leads to lower congestion throughout the city.