The MaxAdContentRating interface used when setting global advert request options.
"General audiences." Content suitable for all audiences, including families and children.
"Mature audiences." Content suitable only for mature audiences; includes topics such as alcohol, gambling, sexual content, and weapons.
"Parental guidance." Content suitable for most audiences with parental guidance, including topics like non-realistic, cartoonish violence.
T: "Teen." Content suitable for teen and older audiences, including topics such as general health, social networks, scary imagery, and fight sports.