The graph of a cubic function  f  is shown in Figure 18 with a labeled point (1.333, 5.185) at its right part. Based on the calculator screen shot, the point  (1.333,5.185)  is which of the following?
Choices:
A.a relative (local) maximum of the function
B.the vertex of the function
C.the absolute maximum of the function
D.a zero of the function
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: The graph of a cubic function  f  is shown in Figure 18 with a labeled point (1.333, 5.185) at its right part. Based on the calculator screen shot, the point  (1.333,5.185)  is which of the following?
Choices:
A.a relative (local) maximum of the function
B.the vertex of the function
C.the absolute maximum of the function
D.a zero of the function
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: The graph of a cubic function  f  is shown in Figure 18 with a labeled point (1.333, 5.185) at its right part. Based on the calculator screen shot, the point  (1.333,5.185)  is which of the following?
Choices:
A.a relative (local) maximum of the function
B.the vertex of the function
C.the absolute maximum of the function
D.a zero of the function