Olga has been asked to provide research regarding adding a new class of Android smartphones to a list of approved devices. One of the considerations is how frequently the smartphones receive firmware OTA updates. Which of the following reasons would Olga NOT list in her report as a factor in the frequency of Android firmware OTA updates?

a$.$ OEMs are hesitant to distribute Google updates because it limits their ability to differentiate themselves from competitors if all versions of Android start to look the same through updates.

b$.$ Because many of the OEMs had modified Android, they are reluctant to distribute updates that could potentially conflict with their changes.

c$.$ Wireless carriers are reluctant to provide firmware OTA updates because of the bandwidth it consumes on their wireless networks.

d$.$ Because OEMs want to sell as many devices as possible, they have no financial incentive to update mobile devices that users would then continue to use indefinitely.