Which cash advance is specifically for providing funds for legally authorized purposes?

The special cash advance is the correct choice because it is designed specifically to provide funds for specific purposes that have been legally authorized. This type of cash advance is often used in government and local treasury contexts to facilitate the execution of projects or activities that require funding in a timely manner. The key aspect of a special cash advance is its alignment with legal requisites, ensuring that the funds are used solely for the purposes prescribed by law.

In comparison, other types of cash advances serve different functions. A regular cash advance typically denotes a more general funding mechanism without the same legal restrictions or specific project focus. A petty cash advance is generally intended for small, incidental expenses, while an operational cash advance is often used for day-to-day business operations. None of these alternatives are specifically aimed at legally authorized purposes in the same way that a special cash advance is. This makes the special cash advance uniquely suitable for ensuring compliance with legal requirements in funding.