What does the Internet$$s Application Programming Interface $($API$)$ specify? $($Select all that apply$)$

Group of answer choices

How to write programs in Java, C$,$ or Python.

How to send a letter via postal service.

How a program running on one end system requests data delivery to another end system.

The rules for sealing envelopes.

How a program requests data transfer to another end system while running on one end system.

The format for writing Bob$$s full name, address, and zip code on an envelope.