Solve the following system using the substitution method or the linear combination method. If there are infinitely many solutions or no solution, so indicate.

The idea of _____ is a form of innovation that constantly seeks ways to improve business processes and add value to products and services.

A. reengineering B. process redesign C. disruptive change D. continuous improvement

Any array's subscripts are always a ____ of integers.

A. group B. sequence C. list D. range