Final answer:
The question seems to have an error as it lists rules that are not directly associated with the paralleling technique of exposing a periapical film sensor. The paralleling technique is based on the rule of isometry, and the proper setup involves ensuring that the image receptor and the tooth are parallel with the x-ray beam being perpendicular, not following the given rules.
Step-by-step explanation:
The dental assistant exposing a periapical film sensor using the paralleling technique should always start with the distal object rule. This is not one of the options directly provided, as the question may contain an error. Typically, the paralleling technique does not include those specified rules, but the 'rule of isometry', which is the principle that governs the paralleling technique. This principle ensures that the image receptor (film, sensor) and the tooth are parallel to each other, and the x-ray beam is perpendicular to both. However, if we were to consider the rules related to object orientation in radiography, one might expect to begin with principles related to the object's positioning in comparison to the dental anatomy such as mesial or distal, but this would be in error. It's essential that the procedure starts with setting up the equipment correctly, using appropriate angulation and positioning of the film sensor following specific technique protocols. The buccal object rule and the lingual object rule are used for determining the position of objects when interpreting dental radiographs and aren't typically referenced during the initial setup for taking a periapical film.