What is the best definition for the word "viable"?

The term "viable" is often used in various contexts, particularly in biology and business, to indicate the ability to live, grow, or develop successfully. In a biological sense, it refers to organisms, cells, or embryos that can sustain life, while in a business context, it can relate to an idea or project that has the potential for success and sustainability. Thus, defining "viable" as "living" captures the essence of being capable of life or existence, which aligns well with the word's origin and common usage. This understanding emphasizes the concept of life and functionality, making it the most accurate definition among the choices provided.