The maximum distance of the apex of a vertical curve of length L from the point of intersection of two grades + g1%, and - g2% (g1 > g2), is

• A. <img src="/_files/images/civil-engineering/highway-engineering/33-16-116-1.png">
• B. <img src="/_files/images/civil-engineering/highway-engineering/33-16-116-2.png">
• C. <img src="/_files/images/civil-engineering/highway-engineering/33-16-116-3.png">
• D. <img src="/_files/images/civil-engineering/highway-engineering/33-16-116-4.png">