The postcondition of a function determines how the function will complete its job. declares the function for the compiler. tells what will be true after the function executes. tells what must be true before the function executes.

The **postcondition** of a function specifically **defines what will be true after the function has executed**. It outlines the state of the system or the return values once the function completes its operation, assuming that all preconditions (conditions that must be true before the function executes) were met. Let's break down each option: 1. **Determines how the function will complete its job.** - This is more related to the **implementation** or **behavior** of the function rather than its postcondition. 2. **Declares the function for the compiler.** - This refers to the **function declaration or prototype**, which tells the compiler about the function's name, return type, and parameters, but not about postconditions. 3. **Tells what will be true after the function executes.** - **Correct.** This is the definition of a postcondition. It specifies the state of the system or the results after the function has run. 4. **Tells what must be true before the function executes.** - This describes the **precondition**, not the postcondition. **Correct Statement:** - **Tells what will be true after the function executes.** This statement accurately captures the essence of a postcondition in the context of programming and software design. **Further Reading:** - **Preconditions and Postconditions** are fundamental concepts in **Design by Contract**, which is a methodology for designing software. Preconditions specify what must be true before a function is executed, and postconditions specify what will be true after the function executes. **References:** - Meyer, B. (1992). *Object-Oriented Software Construction*. Prentice Hall. - Gamma, E., et al. (1994). *Design Patterns: Elements of Reusable Object-Oriented Software*. Addison-Wesley. **Summary:** The postcondition of a function **tells what will be true after the function executes**. > **Answer:** It tells what will be true after the function executes.