How does the work involved in being an estimator for a general contractor differ from that of an estimator who works for a subcontractor?

Select one:

a$.$ All of the above.

b$.$ An estimator for a subcontractor will prepare an estimate only for the part of the project for which they will be involved.

c$.$ The estimator for the general contractor must compile costs on everything that is integrated into the project and put it together into a bid for the entire project.

d$.$ The estimator for the general contractor is responsible for a detailed estimate for the whole project.