What happens as you increase the number of people working on a project from three to six? 

a. The project will get done twice as quickly. 

b. The communication requirements for the project double. 

c. The project might or might not be accelerated. 

d. The communication requirements for the project increase by far more than 2x. 

e. The project will get done twice as quickly and the communication requirements for the project double. 

f. The project might or might not be accelerated and the communication requirements for the project increase by far more than 2x.