Question from the Typescript - Overview test

function compare(a: any, b: any, compareFn: (x: any, y: any) => number): any {
 return compareFn(a, b) > 0 ? a : b;
}

function compare<T>(a, b, compareFn: (x: T, y: T) => number) {
 return compareFn(a, b) > 0 ? a : b;
}

function compare<T>(a: T, b: T, compareFn: (x: T, y: T) => number): T {
 return compareFn(a, b) > 0 ? a : b;
}

function compare(a: T, b: T, compareFn: (x: T, y: T) => number): T {
 return compareFn(a, b) > 0 ? a : b;
}