A primary reason why staff scheduling in services can be more challenging than it is for manufacturing is: Select one: O a. services have less processing variability b. services cannot be inventoried O c. people generally are willing to wait longer for manufactured products d. customers will not wait for services O e. all services use appointments that have to match customers' schedules Risk avoidance can be done by all that which of the following actions? Select one: O a. extending the schedule O b. reducing project scope O c. creating contingency funds O d. clarifying requirements e. all of these are risk avoidance actions