What drawbacks initially prevented the widespread acceptance and use of Opportunistic Key Caching (OKC)?

Opportunistic Key Caching (OKC) is a non-standardized fast roaming method that allows clients to roam between APs without repeating the full 802.1X/EAP authentication process.

OKC was proposed by vendors (not the IEEE or Wi-Fi Alliance), so there was no formal certification early on.

This led to inconsistent and delayed client support, preventing widespread adoption.

Incorrect:

A. OKC does not involve inter-controller roaming in most scenarios; it's a local caching method.

C. The cryptographic overhead was not a significant barrier compared to lack of standardization.

D. OKC was not defined in IEEE 802.11r—Fast BSS Transition (FT) was.