<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def do_authenticate_account(self, authc_token):
 """ Returns an account object only when the current token authenticates AND the authentication process is complete, raising otherwise :returns: Account :raises AdditionalAuthenticationRequired: when additional tokens are required, passing the account object """

        try:
            realms = self.token_realm_resolver[authc_token.__class__]
        except KeyError:
            raise KeyError('Unsupported Token Type Provided: ', authc_token.__class__.__name__)

        if (len(self.realms) == 1):
            account = self.authenticate_single_realm_account(realms[0], authc_token)
        else:
            account = self.authenticate_multi_realm_account(self.realms, authc_token)

        cred_type = authc_token.token_info['cred_type']
        attempts = account['authc_info'][cred_type].get('failed_attempts', [])
        self.validate_locked(authc_token, attempts)

        # TODO:  refactor this to something less rigid as it is unreliable:
        if len(account['authc_info']) > authc_token.token_info['tier']:
            if self.mfa_dispatcher:
                realm = self.token_realm_resolver[TOTPToken][0]  # s/b only one
                totp_token = realm.generate_totp_token(account)
                mfa_info = account['authc_info']['totp_key']['2fa_info']
                self.mfa_dispatcher.dispatch(authc_token.identifier,
                                             mfa_info,
                                             totp_token)
            raise AdditionalAuthenticationRequired(account['account_id'])
        return account