TAXII provides a set of services to enable sharing of threat intelligence. So that is not the correct answer. STIX is a collaborative effort to develop a standardized, structured language to represent cyber threat information. The STIX framework intends to convey the full range of potential cyber threat data elements and strives to be as expressive, flexible, extensible, automatable, and human-readable as possible. This is the correct answer. CEE, or the common event expression, offers a standardized schema for the specification and communication of system and network events. So, this is not the correct answer. And STIX does not provide an API for security platform integration. So that is not the correct answer either.