Final answer:
A function in programming is defined by its name and the statements in its body. The header includes the function name and parameters, while the body comprises the executable statements.
Step-by-step explanation:
When defining a function in programming, it is specified by its name and the statements that form its body. The name is the identifier by which the function can be called in the code, while the statements within the body define what the function does when it is called. In many programming languages, a function's definition includes a header and a body. The header typically consists of the function name, return type, and parameters, which are variables used as inputs. The body contains the executable statements that carry out the function's purpose.
While the options given to choose from do not directly match programming terminology, the closest match to what defines a function is 'Name and statement(s)', which reflects the function's header (name and parameters) and its body (statements).