A 20 V source (+ at top) drives current through a silicon diode D1 into node P. From P, a resistor R₁ = 3.3 kΩ and a silicon diode D2 (anode at P) are connected in parallel to node Q; a resistor R₂ = 5.6 kΩ returns from Q to the negative terminal of the source. Taking 0.7 V for each conducting silicon diode, find (a) I₁ in R₁, (b) I₂ in R₂ and (c) the current in D2, all in mA.