What is window space factor?

• A. window space factor = copper area in the window ‚Äö√Ñ√∂‚àö√ë‚àö¬® total window area
• B. window space factor = copper area in the window + total window area
• C. window space factor = copper area in the window * total window area
• D. window space factor = copper area in the window / total window area