Final answer:
Broker-dealers are required to provide customers with account statements at least quarterly, which summarize the activities and balances of a customer's account.
Step-by-step explanation:
Broker-dealers are required to provide customers with account statements at least quarterly.
Account statements are documents that summarize the activities and balances of a customer's account. They provide important information such as transaction details, positions held, and account balances.
By receiving regular account statements, customers can keep track of their investments, identify any errors or discrepancies, and make informed decisions about their financial holdings.