What is one advantage of using EAP-TTLS instead of EAP-TLS as an authentication mechanism in an 802.11 WLAN?

A: EAP-TTLS sends encrypted supplicant credentials to the authentication server, but EAP-TLS uses unencrypted user credentials. B: EAP-TTLS supports client certificates, but EAP-TLS does not. C: EAP-TTLS does not require an authentication server, but EAP-TLS does. D: EAP-TTLS does not require the use of a certificate for each STA as authentication credentials, but EAP-TLS does.