The gauge factor is defined as:

• A. \(\frac{{\Delta L/L}}{{\Delta R/R}}\)
• B. \(\frac{{\Delta R/R}}{{\Delta L/L}}\)
• C. \(\frac{{\Delta R/R}}{{\Delta D/D}}\)
• D. \(\frac{{\Delta R/R}}{{\Delta P/P}}\)