What is required to legally purchase a handgun in Louisiana?

In order to legally purchase a handgun in Louisiana, you must have a Louisiana driver's license or ID, undergo a background check, and provide proof of residency. Option A is incorrect because the other requirements are also necessary. Option B is incorrect because having a driver's license or ID is also required. Option C is incorrect because the other requirements are also necessary. Therefore, the correct answer is D, all of the above.