The result of this code is `'Hello, Guest'`. Default parameter expressions, including function calls, are evaluated at call time, not when the function is defined. When `greet()` is called without arguments, the default parameter `name = getName()` is activated. The function `getName()` is executed, returning the string `'Guest'`, which becomes the value of the `name` parameter. This demonstrates that default parameters can be dynamic and invoke functions to determine their values. This is particularly useful for generating default values that need to be computed or retrieved from external sources. Note that the function call occurs only when needed—if a value is provided for the parameter, the default expression is not evaluated. This behavior allows for efficient lazy evaluation of potentially expensive default value calculations.