Which of the following is an exclusive right provided by a patent?

A patent grants the inventor a set of exclusive rights, which are designed to protect the intellectual property associated with an invention. This means that the inventor has the authority to control how their invention is used, reproduced, and distributed.

The right to modify the invention refers to the inventor’s ability to make changes or improvements to their creation. This is important because it allows the inventor to refine their invention without fear of infringement from others.

The right to sell the invention for 20 years indicates that the patent holder can commercially exploit their invention for two decades, preventing others from selling or manufacturing the patented invention without permission. This time frame is established to encourage innovation while eventually allowing the public to benefit from the invention once the patent expires.

Furthermore, the right to license the invention to others provides a means for the patent holder to generate income by allowing third parties to use their invention under specified conditions. This can be a vital part of a patent strategy, as it can lead to partnerships and expanded market reach.

Since all of these rights — modification, sale, and licensing — are inherently included in a patent's exclusivity, the comprehensive nature of the rights confirms that option "All of the above" is indeed correct.