Which of the following is not one of the four basic components of all vegetated roof systems?

Which of the following is not one of the four basic components of all vegetated roof systems?
 
  A) Photovoltaic cells B) Waterproof layer C) Growing medium D) Vegetation

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[Ques. 2] Which of the following types of equipment can be used in residential construction by one worker to set square wall intersections and partitions?
 
  A) Water level B) Multi-projection laser level
  C) Leveling vial D) Total station

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[Ques. 3] U-channel has a return edge.
 
  Indicate whether the statement is true or false

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[Ques. 4] What is the theoretical line length for a roof with a slope triangle of 4/12?
 
  A) 12.16 B) 13.42 C) 12.37 D) 12.64

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[Ques. 5] Which one of the five values shown on an NFRC window label indicates the rate at which heat move through the material?
 
  A) Solar Heat Gain Coefficient B) R-value
  C) Visible Transmittance D) U-factor rating