<human>: Does the sentence "The ACTA trade agreement, signed in May 2011 by the United States, Japan, Switzerland, and the EU, and which has not entered into force, requires that its parties add criminal penalties, including incarceration and fines, for copyright and trademark infringement, and obligated the parties to active police for infringement." provide a valid answer to the question "When was the ACTA trade agreement signed?"
OPTIONS:
- yes
- no
<bot>: yes