Final answer:
Shaklee Corporation's new headquarters features open workspaces, optimized natural light, and a plenum for HVAC efficiency, so the answer is 'all of the above'.
Step-by-step explanation:
The Shaklee Corporation incorporated several “green” features into the design of their new headquarters in Pleasanton, California. These features include open workspaces that facilitate better air flow and a collaborative environment, the optimization of natural light to reduce the need for artificial lighting, and the use of a plenum for efficient heating, ventilation, and air conditioning (HVAC). Accordingly, the answer to the question is '4) all of the above'.