题目内容：
根据以下内容，回答题。Telephone Billing Statement -- City Phone Cellular
City Phone Cellular
Department of Billing Services
51 Dublin St., Suite 301
Springfield, WI
Invoice Date: 08-15-2006
Payment Due Date: 09-14-2006
Customer Information
Name: Desire Eberhardt
Account Number: 10003483-FFT
Account Information
Current Charges: $61.59
Outstanding Balance: $35.08
Total Amount Owed: $96.67
Pay your bill online at www.cpcellular.com and receive a discount of 3% before taxes are added. If you have questions about this or other City Phone Cellular policies, please contact our customer service department at 1-888-349-5959.
Billing SummaryAmount Owed
Current Charges:
City Phone Premium Cellular Package$49.95
State Taxes$5.65
Service Fee $5.99
Total Current Charges $61.59
Previous Charges:
Balance as of Last Month $55.08
Payment Received Last Month $20.00
Outstanding Balance $35.08
Total Amount Owed $96.67
How can City Phone Cellular customers receive a discount? A．By applying for an account online
B．By paying their balance early
C．By calling the customer service department
D．By paying over the Interact
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