Please help soon! Divide the set of data into four quartiles.

4, 5, 7, 11, 12, 15, 16, 18

First group = .
(1). 4 and 5
(2). 7 and 11
(3). 4, 5, 7, and 11
(4). 12, 15, 16, and 18
Second group = .
(1). 4 and 5
(2). 7 and 11
(3). 4, 5, 7, and 11
(4). 12, 15, 16, and 18
Third group = .
(1). 4 and 5
(2). 7 and 11
(3). 4, 5, 7, and 11
(4). 12, 15, 16, and 18
Fourth group = .
(1). 4 and 5
(2). 7 and 11
(3). 4, 5, 7, and 11
(4). 12, 15, 16, and 18