For proper maintenance of our vehicle's battery we must...
A)Keep the terminals clean and well tightened.Correct
B)Add distilled water to the battery periodically.
C)The battery does not require any special maintenance.
In a so-called "maintenance-free" battery, which are those usually used in passenger cars, we will not pay attention to the level of the electrolyte but to the terminals and their connection to the vehicle. These terminals must be clean, well tightened and covered with soft grease.