Universal Containers (UC) requested that when a support case is open for more than 7 days, a chatter post should be posted to the Regional could the admin meet this requirement?

Universal Containers (UC) requested that when a support case is open for more than 7 days, a chatter post should be posted to the Regional could the admin meet this requirement?
A . Apex trigger
B. LWC component
C. Scheduled workflow rule
D. Scheduled process builder

Answer: D