Identify the segment in the sentence that contains a grammatical error.
The ancient tree in the center of the park, towering enormous in size and casting a wide, cool shadow, had become a beloved local landmark over the years, a testament to the enduring beauty of nature.
1
The ancient tree in the center of the park
2
had become a beloved local landmark over the years, a testament to the enduring beauty of nature
3
towering enormous in size and casting a wide, cool shadow
4
No error