jsで関数を定義するために使用できるパラメータの数はいくつですか

<code class="javascript">function greet() {
  console.log("Hello!");
}</code>

<code class="javascript">function greet(name) {
  console.log("Hello, " + name + "!");
}</code>

<code class="javascript">function calculateArea(length, width) {
  return length * width;
}</code>

<code class="javascript">function sum(...numbers) {
  let total = 0;
  for (const num of numbers) {
    total += num;
  }
  return total;
}</code>

<code class="javascript">function greet(name = "John") {
  console.log("Hello, " + name + "!");
}</code>