Gerta is faced with $$a big rush$$ on her project due to a demand from the customer to bring the end$-$date in by $3$ weeks. She decides to add $4$ new coders and $10$ testers to accelerate the timeline. Gerta has chosen which form of schedule compression?

a$.$

Critical Path Merging

b$.$

Crashing

c$.$

Fast$-$Tracking

d$.$

Escalation