The figure below shows an extract of an Upper Campus Building at UCT. The project at hand is to conduct a high precision 3D survey of the basement inside the building labelled P on the right and 6 metres below the ground floor. Known control points, labelled GC1 through GC4, are spaced at the corners of the building perimeter on the ground floor, with G1 – G6 in the building centre of the ground floor. All these control points are both planimetric and height-based control points and may be helpful in transferring control to the points B1 through B4 that are to be set in the basement. You oversee the survey. You are free to select instruments for the survey, the measurements to make and the method of computation. Using your knowledge of network design and analysis, outline how you would proceed with the pre-analysis and implementation to transfer control from ground to basement. Outline the appropriate instruments you would select for the job, configurations, observations, and the computational considerations, if applicable to make. Explain your choices and plan. You are advised to include a diagram to answer. (10)