Exam CRT-450 topic 1 question 260 discussion

The invocable method must be static and public or global. There can be at most one input parameter of type List. If the return type isn’t Null, the data type returned by the method must be List: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_annotation_InvocableMethod.htm So the correct answer should be like : @InvocableMethod global static List<List<Recommendation>> getLevel(List<ContactWrapper> input) { /*implementation*/ }