The CUSTOMERS table has these columns: The CUSTOMER_ID column is the primary key for the table.Which two statements find the number of customers? （）

• A、SELECT TOTAL(*)   FROM customers;
• B、SELECT COUNT(*)   FROM customers;
• C、SELECT TOTAL(customer_id)   FROM customers;
• D、SELECT COUNT(customer_id)   FROM customers;
• E、SELECT COUNT(customers)   FROM customers;
• F、SELECT TOTAL(customer_name)   FROM customers;