The unknown resistance R4 measured in a Wheatstone bridge by the formula \({R_4} = {\frac{{{R_2}{R_3}}}{{{R_1}}}_{}}\) withR1 = 100 ± 0.5% Ω,R2 = 1000 ± 0.5% Ω,R3 = 842 ± 0.5% Ωresulting in R4

• A. 8420 ± 0.5% Ω
• B. 8420 ± 1.0% Ω
• C. 8420 ± 1.5% Ω
• D. 8420 ± 0.125% Ω