19.Marianne Lynn is registered for the CFA Level I exam. A few weeks after registration, she realizes that she is unable to prepare for the exam due to work commitments, so she informs CFA Institute that she declines to sit for the exam. Afterwards, shortly before the exam date, she posts on social media that she is a CFA candidate. Separately, Thomas Petrov, CFA, posts his investment views anonymously on social media and tags his post using "#CFAcharter." Who has violated the Standards?