What does this cache-boundary check print?

What does this cache-boundary check print?

const expiresAt = 30;

function source(now) {
  return now < expiresAt ? "cache" : "refresh";
}

console.log(`t=29 ${source(29)}`);
console.log(`t=30 ${source(30)}`);

1. t=29 cache t=30 refresh
2. t=29 cache t=30 cache
3. t=29 refresh t=30 refresh
4. It throws because TTL 30 is invalid.