Correct answer is B,D.


Arrow functions, also known as fat arrow functions, have unique features compared to regular function definitions. The correct options that highlight these unique features are:

B. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.

D. The function uses the this from the enclosing scope.

Explanation:
B. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.

This is a unique feature of arrow functions. If the body of the function consists of a single expression, you can omit the curly braces and the return keyword, and the expression will be implicitly returned.
const add = (a, b) => a + b;
// equivalent to:
// const add = (a, b) => { return a + b; };

D. The function uses the this from the enclosing scope.

Arrow functions do not have their own this context. Instead, they lexically inherit this from the surrounding code at the time they are defined, which means they use the this value from their enclosing scope. This makes arrow functions particularly useful for preserving the this context in situations like method definitions or callback functions.
function Person() {
this.age = 0;

setInterval(() => {
this.age++; // `this` refers to the `Person` instance
}, 1000);
}

const person = new Person();...

Correct is A and B
No matter how or where being executed, this value inside of an arrow function always equals this value from the outer function. In other words, the arrow function resolves this lexically.
https://dmitripavlutin.com/differences-between-arrow-and-regular-functions/#1-this-value