What does it mean to endorse a check?

a. to write a check to make a payment
b. to sign a check before cashing or depositing it
c. to record a check in the check register
d. to locate a check in the bank statement

As the inventor of hypertension medication, onesure pharmaceuticals (osp) inc. was able to reap the benefits of economies of scale due to a large consumer demand for the drug. even when competitors later developed similar drugs after the expiry of osp's patents, regular users did not want to switch because they were concerned about possible side effects. which of the following benefits does this scenario best illustrate? a. first-mover advantages b. social benefits c. network externalities d. fringe benefits