How are you required to conduct yourself according to the following road signs?

1. It is prohibited to drive slower than the speed indicated in the sign.
2. Correct answer: Slow down and keep to the right before entering the curve.
3. The last road sign is the determining one; drive 90 k.p.h.
4. Drive normally. The placement of the road signs is unlawful.

WhyThe bend sign matters more than the 90: slow down and keep right before the bend. The signs here are legitimate.