Only which type of neck undergarments shall be worn under the long/short sleeve uniform shirts?

The correct choice regarding the type of neck undergarments that may be worn under the long or short sleeve uniform shirts is indeed a crew neck style. This type of undershirt aligns with the professional standards typically upheld in uniform wear, as it ensures a clean and neat appearance while providing adequate coverage.

Crew neck undershirts are designed to sit snugly around the neck, which makes them less visible when worn underneath a uniform shirt. This minimizes any distractions from the primary uniform appearance, maintaining a polished look that is often required in formal or professional settings.

On the other hand, options such as V necks and white tank tops could potentially be visible and may not provide the same level of uniformity and professionalism. The crew neck style is the most appropriate choice, ensuring that the undergarments complement rather than detract from the formal uniform appearance.