Final answer:
It is generally true that a customer must sign an options agreement within a specified time frame, commonly 15 days, after opening a trading account to engage in options trading.
Step-by-step explanation:
The requirement for a customer to sign an options agreement within a specified time frame after the opening of an account is a regulation in the financial services industry. This is generally true, because the options agreement discloses the risks associated with options trading and obtains the customer's acknowledgment of understanding those risks before they can begin options trading.
Brokerages or financial institutions may have different time frames for this requirement, but a 15-day period is common practice in the industry. Thus, without specific regulatory changes or different brokerage rules, the statement is typically considered true.