Final answer:
The function f(x) = ∫[1 to x²] √(t² + 3) dt represents an Integral Function.
Step-by-step explanation:
The function f(x) = ∫1 to x² √(t² + 3) dt represents an Integral Function.
This is because the function is defined as the integral of a function with respect to x (x² in this case), which gives us the accumulated area between the graph of the function and the x-axis.
Therefore, the answer is D) Integral Function.