What is the primary purpose of IBM watsonx Code Assistant for Z (wca4z)?

Think of it like working hands-on with IBM mainframe systems — the answer here is 'To automate discovery, refactoring, and AI-assisted transformation of mainframe COBOL into Java'. IBM watsonx Code Assistant for Z is purpose-built to modernize mainframe COBOL using generative AI to discover, explain, refactor, and transform code into Java while preserving business logic. On real mainframe exams, this concept comes up repeatedly so make sure you have it locked in.