What Does the Concept "Build-Measure-Learn" in the Context of the Lean

What does the concept "build-measure-learn" in the context of the lean start-up model represent?

A) The separation between the learning received from customers and what determines whether you change, tweak, or continue to build your product
B) To turn ideas into products, measure how customers respond, and then learn how to pivot or persevere.
C) The continuous circle in which the learning received from the production process determines whether you change, tweak, or continue to build your customer segment
D) None of these answers