Highlight the possible risk and problem that should be addressed during the implementing process

Which number on the image above correctly indicates the name of a folder in this url? a.1b.2c.3d.4

Kyle, a receptionist for a building supply company, recently won an award for saving his company money on their phone system. after being presented with kyle's research, the company changed the way in which it made long-distance phone calls and cut their expenses in this area by 75 percent. the new system the kyle's company most likely adopted was wired communications switching stations voip hdtv

Whats three fourths of 15(this is supposed to be in math but i clicked too fast)