; (B) an identification of at least one patent issued by the United States Patent and Trademark Office alleged to have been infringed; (C) an identification, to the extent reasonable under the circumstances, of at least one product, service, or other activity of the recipient that is alleged to infringe the identified patent; (D) a description, to the extent reasonable under the circumstances, of how the product, service, or other activity of the recipient infringes an identified patent and patent claim