In professional data modeling and business analytics, it is essential to distinguish between different ways to combine functions. Match each algebraic notation with its correct operation name and mathematical definition.

In mathematical modeling and data analysis, it is essential to use the correct operations to combine functions. Which of the following statements correctly identifies the difference between function composition, denoted as $(f \circ g)(x)$, and function multiplication, denoted as $(f \cdot g)(x)$?

In a corporate financial model, the notation $(f \circ g)(x)$ indicates that the user should multiply the output of function $f(x)$ by the output of function $g(x)$.

Algebraic Definitions of Function Composition and Multiplication

When building a financial forecasting model, substituting the entire output expression of a market trend function into the input variable of a revenue function, effectively nesting them such that you calculate $f(g(x))$, is defined algebraically as function ____. This operation is fundamentally different from evaluating each function independently and multiplying their outputs.