Write a gui for a user buying a cell phone. they have the following choices: data plans (can only select 1): 8 gigabytes per month: $45.00 per month 16 gigabytes per month: $65.00 per month 20 gigabytes per month: $99.00 per month phones (can only select 1): model 100: $299.95 model 110: $399.95 model 200: $499.95 extras (can select up to 2): insurance: $5.00 per month wifi hotspot capability: $10.00 per month