Consider the following statements :
1. The distance between the lines
`y=mx+c_(1)` and `y=mx+c_(2)` is `(|c_(1)-c_(2)|)/sqrt(1-m^(2))`.
2. The distance between the lines `ax+by+c_(1)` and `ax+by+c_(2)=0` is `(|c_(1)-c_(2)|)/sqrt(a^(2)+b^(2))`.
3. The distance between the lines `x=c` and `x=c_(2)` is `|c_(1)-c_(2)|`. Which of the above statements are correct ?
A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3