At which types of Farm Credit System offices $($PCA$,$ FLBA, FLCA, ACA, or BC$)$ would the following loans be available? There may be more than one answer for each question.

a$.$ a loan for the purchase of a farm

b$.$ a line of credit for a greenhouse to pay for operating expenses for the upcoming year

c$.$ a loan for a farm cooperative to expand its storage facilities

d$.$ an operating loan for an agricultural chemical company that is heavily involved in the on$-$farm application of its chemicals

e$.$ a real$-$estate refinancing loan to a dairyman to build a new milking

F$.$ a loan for a farmer to purchase a tractor