As protection, options can guard against price fluctuations in the near term because they provide the right to acquire the underlying stock at a fixed price for a limited time. (transamerica.com)
Offers are sold at a fixed price in limited quantities and are available on a first - come, first - serve basis. (flyingfromthefront.com)
Calls give you a right, but not the obligation, to buy a stock at a fixed price, for a fixed period. (tsinetwork.ca)