Complete the following sentence for each of these investors:
a. A buyer of call options.
b. A buyer of put options.
c. A seller (writer) of call options.
d. A seller (writer) of put options.
"The (buyer/seller) of a (put/call) option (pays/receives) money for the (rightobligation) to (buy/sell) a specified asset at a fixed price for a fixed length of time."