Objective-C is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. It was the main programming language used by Apple for the OS X and iOS operating systems, and their respective application programming interfaces (APIs) Cocoa and Cocoa Touch prior to the introduction of Swift. Using only the above description and what you know about the world, "Objective-C was instrumental in the development of the program known as Swift." is definitely correct, incorrect, or inconclusive? 