Why are design patterns generally discovered and are not created?

 Design pattern are generally not created because it is difficult to verify that whether it is helpful for others to solving their problems or not.

The main aim of design pattern is that providing the software platform for communication. It basically describe the pattern of software design.

For creating a design pattern high efforts and struggle is required and we also realized that by adopting the similar technologies, they solve the same problem. Therefore, the design pattern are not created but discovered.  

i guess the correct option is letter a.

use contrasting font sizes, but the same font style