Is holden caulfield a dynamic or flat character? why?

the difference between a dynamic character and a flat character is that a dynamic character changes throughout the novel. It is very clear that Holden Caulfield grows as a person during the narrative. He gains a sense of responsibility and realizes part of his frustration towards everything is due to his angst. he is also a dynamic character because he is an unreliable narrator and it is unclear whether what he says to us is the truth or not, and his opinions change throughout the book