Which of the following statements describes sustainable development?

a$.$ It has become a top concern for many businesses as it involves meeting the needs of the present without compromising the ability of future generations to meet their own needs.

b$.$ It is relatively simplistic, so it's easy for businesses to determine what to evaluate when investigating ways to increase the sustainable impact of their organizations.

c$.$ It involves meeting only the needs of the present.

d$.$ It has the same meaning globally.

e$.$ It has an emphasis on viable infrastructure.