Where to File Form I-539 for B-2?

[XtremeCold]

I am filing the form I-539 for my grandmother to extend her stay in US for medical reasons. She is on B-2 Visa now.
However, I cannot understand what address to choose from their website below. Can anyone help take a look at the link below? I appreciate your help.
https://www.uscis.gov/i-539-addresses

 

[newacct]

It's the last one, "All other Forms I-539"

 

[XtremeCold]

It's the last one, "All other Forms I-539"

Thank you newacct.

 

[Lewis-H]

For U.S. Postal Service: USCIS. P.O. Box 660166. Dallas, TX 75266.
For Express mail and courier deliveries: USCIS. Attn: I-539. 2501 S. State Highway 121 Business. Suite 400. Lewisville, TX 75067.