Extract the different storage configurations available to the iPhone 14 that are mentioned in the text. Put them in a comma separated list.

iPhone 14 and 14 Plus are available in three internal storage configurations: 128, 256, and 512 GB. It has 6 GB of RAM, an increase over the iPhone 13 and 13 mini model's 4 GB of RAM. The iPhone 14 and 14 Plus have the same IP68 rating for dust and water resistance as their predecessors.

128 GB, 256 GB, 512 GB