In what year was the album “Seven Springs of Apink” released by Apink (에이핑크)?

In what year was the album “Seven Springs of Apink” released by Apink (에이핑크)?: The album “Seven Springs of Apink” was released in 2011 by Apink (에이핑크), featuring 5 tracks.
What is the most successful song from the album “Seven Springs of Apink” by Apink (에이핑크)?: “Boo” is the biggest hit from the album “Seven Springs of Apink” by Apink (에이핑크).

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