public static List<String> getSelectableMultifactorAuthenticationProviders(final RequestContext requestContext) {
        return requestContext.getViewScope().get("mfaSelectableProviders", List.class);
    }
Gets selectable multifactor authentication providers.

@param requestContext the request context
@return the selectable multifactor authentication providers
core/cas-server-core-webflow-mfa-api/src/main/java/org/apereo/cas/web/flow/util/MultifactorAuthenticationWebflowUtils.java