Final answer:
In Texas, an on-site apartment manager, an attorney-in-fact conducting a limited number of transactions, and a public official performing official duties do not require real estate licenses.
Step-by-step explanation:
Individuals who do not need to be licensed in the state of Texas to practice real estate include an on-site manager of an apartment complex, an attorney-in-fact authorized under a power of attorney to conduct no more than three real estate transactions annually, and a public official while engaged in official duties. Therefore, the correct answer to who does NOT need to be licensed in the state of Texas to practice real estate is D. All of the above.