Read the passage and answer the questions that follow : Management of a school plans to redesign their school garden so as to include a lawn, flower beds, a small water fountain and a sitting area for students. The school administration has limited knowledge of landscaping and is not willing to hire a professional landscape architect. Ultimately it was decided to use a CAD software for redesigning the school garden.
(a) Explain the role of CAD in landscape design.
(b) Name any two CAD software which the school can use for redesigning their school garden.