Alpha Co$.$ is trying their best to reduce the duration of their project length. All of the following strategies would help to shorten the project schedule, EXCEPT one. Which is it$?$

a$.$

Alpha should remove resources from the critical path, and allocate them to other pathways.

b$.$

Alpha could shorten tasks that cost the least to speed up$.$

c$.$

Alpha should shorten the duration of activities on the critical path.

d$.$

Alpha should introduce laddering activities into the schedule.