The electric connections to your towing vehicle are interrupted. What device on the trailer is therefore rendered inoperable?

The combination of options 1 and 2, which includes the anti-lock braking system (ABS) and the electronic braking system (EBS), is correct because both systems rely on electrical connections to function properly. In German traffic regulations, these systems are essential for ensuring the vehicle's braking efficiency and safety.

The ABS prevents wheel lockup during hard braking, allowing for better control and shorter stopping distances. The EBS enhances braking performance by electronically controlling the brake force applied to each wheel, further improving stability. If the electrical connections are interrupted, these safety features become inoperable, significantly increasing the risk of accidents.

Traction control systems (TCS), while also important for vehicle stability, are not directly related to the essential braking functions that ABS and EBS fulfill. Thus, in the context of this question, it's vital to understand that both ABS and EBS are critical for braking safety, making their inclusion in the answer necessary.