how can i set this type of cases?

i. Create new activity category “Request Validation”, and allow for it to finish with one

of three possible results: “Valid”, “Invalid”, and “Canceled”.

ii. Create Task: “Validate Request” of category - “Request Validation”, the task must

be visible in assignee’s calendar, and assigned to the owner’s manager. System

immediately creates the task upon advancing to the stage, and designates it as a

“Required Step”.

iii. Send Email to the Owner of the task advising him/her of result reached in Validate

Request task. If the result of the Activity is “Valid” then send an email with the

following Subject: “Your request has been Validated”, otherwise send it with: “Your

request has NOT been Validated” in the subject line.