In what year was the album “Hits! Hits!” released by KARA?

In what year was the album “Hits! Hits!” released by KARA?: The album “Hits! Hits!” was released in 2011 by KARA, featuring 10 tracks.
What is the most successful song from the album “Hits! Hits!” by KARA?: “STEP” is the biggest hit from the album “Hits! Hits!” by KARA.

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