When was sign language interpreting first recognized as a profession?

(2 points)
Responses

1964 by the Registry of Interpreters for the Deaf
1964 by the Registry of Interpreters for the Deaf

1999 by the Registry of Interpreters for the Deaf
1999 by the Registry of Interpreters for the Deaf

1800s by Gallaudet and Clerc
1800s by Gallaudet and Clerc

1900s by American School for the Deaf

1964 by the Registry of Interpreters for the Deaf