A rider with eight months of licence tenure carries a pillion passenger outside a built-up area. Which restriction applies to them under the Belarusian Traffic Rules?

1. They may not carry a pillion passenger at all until two years have elapsed
2. They must not exceed 70 km/h and must display the 'Speed restriction' identification sign at the rear left
3. They must keep to the shoulder at all times
4. They must be escorted by a second, more experienced rider