A rational number (or fraction) is represented as a ratio between two integers, a and b, and has the form \({a \over b}\) where a is the numerator and b is the denominator. An improper fraction (\({5 \over 3} \)) has a numerator with a greater absolute value than the denominator and can be converted into a mixed number (\(1 {2 \over 3} \)) which has a whole number part and a fractional part.
Which of the following is an improper fraction?
\(1 {2 \over 5} \) 

\({2 \over 5} \) 

\({a \over 5} \) 

\({7 \over 5} \) 