Which of the following is NOT one of the common types of rejections?

The correct response identifies that inequitable conduct does not fall under the standard types of rejections that a patent application may receive during examination.

Rejection under 103 pertains to obviousness, meaning that a claimed invention is not patentable because it would have been obvious to someone skilled in the art at the time the invention was made. A rejection based on 112(a) focuses on the written description requirement, ensuring that the patent application describes the claimed invention in sufficient detail so that those skilled in the art can understand what is being claimed. A rejection for 101 involves patentable subject matter, addressing whether the invention fits within the categories allowed for patenting, such as processes, machines, articles of manufacture, or compositions of matter.

Contrarily, inequitable conduct is not a rejection per se but rather a potential ground for rendering a patent unenforceable due to a patentee's misconduct during prosecution, such as failing to disclose relevant prior art. This concept relates more to the enforceability of issued patents rather than the examination process for determining the patentability of an application. Thus, it is not classified as one of the common types of rejections that applicants face during patent prosecution.