Answer:
Semi strong form of market efficiency
Explanation:
Semi strong form of market efficiency holds the belief that security prices quickly adjust to reflect new information as it has accommodated public and available and private market information , as a result of which the need for deeper analysis of stock before investment might not be required.
As it is already known that a green suit on the CFO signifies a potential positive information about the company, making use of this private information towards investment is in line with the Semi strong form of market efficiency .