Final answer:
Both Technician A and Technician B are correct; electronic voltage regulators are typically sealed units and cannot be easily repaired, and their circuits are often surrounded by a protective rubber-like gel for durability and environmental protection.
Step-by-step explanation:
Both Technician A and Technician B have made statements that are consistent with common practices in the design and manufacture of automotive voltage regulators. Technician A mentions that an electronic voltage regulator is often a sealed unit and, as such, cannot be readily repaired. This is because opening the sealed unit could compromise its integrity, leading to potential failure due to contamination or other issues. Technician B's claim that the circuits of an electronic voltage regulator are commonly protected by a rubber-like gel, which is often a type of potting compound, is also correct. This gel provides protection against mechanical shock, vibrations, and environmental factors, such as moisture or chemical contaminants, which could otherwise damage the sensitive electronic components.