Question 403 in the bank

Which traffic sign that is placed before an intersection requires drivers to give right-of-way?

Four numbered signs: 308 blue square with red down arrow and white up arrow; 310 yellow diamond with black diagonal band; 301 inverted red-bordered white triangle; 504 blue square with small yellow down arrow, large white up arrow.
  1. Correct answer: 301
  2. 504
  3. 308
  4. 310

Why this is the answer

The correct answer in the official bank: 301

Sign 301, an inverted triangle with a red border, is placed before an intersection and requires you to give right-of-way. You may enter the intersection only when doing so creates no danger or obstruction to traffic. Signs 308 and 504 concern oncoming traffic, and sign 310 marks the end of a road with right-of-way, so none of them is the right one.

Topic: Traffic signs. The bank marks it for these classes: Light truck (C1), Heavy truck (C), Bus (D), Motorcycle (A), Tractor (1), Private car (B).