transportation engineers major focus areas include which of the following? a. surface water hydrology, groundwater hydrology, and hydraulics b. subsurface sampling and classification; engineering properties of soils and rock; groundwater seepage, foundations, earthen structures; slope stability; retaining walls; and geosynthetics c. parking, roads, highways, mass transit, airports, shipping ports, and rail d. drinking water treatment, water supply, wastewater treatment, surface water quality, air quality, containment suites, wetland mitigation, solid and hazardous waste management, and stormwater management e. buildings, bridges, tunnels, and towers