Your Code Is Running on Cloud Functions in Project A It

Your code is running on Cloud Functions in project A. It is supposed to write an object in a Cloud Storage bucket owned by project B. However, the write call is failing with the error "403 Forbidden". What should you do to correct the problem?

A) Grant your user account the roles/storage.objectCreator role for the Cloud Storage bucket.
B) Grant your user account the roles/iam.serviceAccountUser role for the [e-mail] service account.
C) Grant the [e-mail] service account the roles/storage.objectCreator role for the Cloud Storage bucket.
D) Enable the Cloud Storage API in project B.