Which religious publication has used the famous tagline "The Magazine of Understanding" since the 1930s?

Throughout history, religious organizations and spiritual publications have developed distinctive taglines to communicate their core values and attract followers. These marketing phrases often become deeply embedded in cultural consciousness and serve as powerful tools for brand recognition. Test your knowledge of famous spiritual taglines that have shaped religious marketing in the modern era. Can you match these well-known phrases to their correct religious organizations or publications?

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The Plain Truth (Worldwide Church of God)
Christianity Today (Christianity Today International)
Guideposts (Guideposts Foundation)
The Watchtower (Jehovah's Witnesses)