Two texting options for a phone are available for a limited number of customers. The first plan has an $80 deposit but a low monthly cost of $10 a month for unlimited texting. The second plan has a $20 deposit, but costs $30 a month for unlimited texting. The costs of the two plans are shown in the graph below. How many months must a customer use either of the two plans in order to pay the same amount of money? A. 3 B. 5 C. 4 D. 2