Final answer:
a) Pacinian corpuscles
Pacinian corpuscles and Ruffini endings are tactile receptors located in the dermis, with Pacinian corpuscles adapted for sensing deep pressure and vibration and Ruffini endings for detecting stretch and warmth.
Step-by-step explanation:
The tactile receptors located in the dermis include the Pacinian corpuscles and Ruffini endings. Pacinian corpuscles are encapsulated mechanoreceptors that are found deep in the dermis and respond to deep transient pressure and high-frequency vibration. Ruffini endings also reside in the dermis and are responsible for detecting skin stretch and warmth. Conversely, Merkel's disks and Meissner's corpuscles are found in the more superficial layers of the skin and are associated with the sensation of fine touch, with Merkel's disks being abundant on the fingertips and lips.
However, while Pacinian corpuscles and Ruffini endings are indeed located in the dermis, the original question may have a specific answer in the context of a multiple-choice question. Based on typical educational material, Pacinian corpuscles would be the answer that most accurately fits the criteria of being a tactile receptor in the dermis.