Two 1.2 kΩ resistors are in series and this series combination is in parallel with a 3.3 kΩ resistor. The total resistance is____________?

Two 1.2 kΩ resistors are in series and this series combination is in parallel with a 3.3 kΩ resistor. The total resistance is____________?

A. 138 Ω
B. 1,389 Ω
C. 5,700 Ω
D. 880 Ω