code: public void setAuthenticationOptions(java.util.Collection<ClientVpnAuthentication> authenticationOptions) {
          if (authenticationOptions == null) {
              this.authenticationOptions = null;
              return;
          }
  
          this.authenticationOptions = new com.amazonaws.internal.SdkInternalList<ClientVpnAuthentication>(authenticationOptions);
      }
docs: <p>
  Information about the authentication method used by the Client VPN endpoint.
  </p>
  
  @param authenticationOptions
  Information about the authentication method used by the Client VPN endpoint.