DiskDrive$($serialNumber$,$ manufacturer, model, batch, capacity, retailer$).$

Each tuple in the rela$8$on DiskDrive contains informa$8$on about a disk drive with a unique serialNumber, made by a manufacturer, with a par$8$cular model, released in a certain batch, which has a certain storage capacity, and is sold by a certain retailer. For example, the tuple DiskDrive$(1978619,$ WesternDigital, A$2235$X$,765234,500,$ BestBuy$)$ specifies that WesternDigital made a disk drive with serial number $1978619,$ model number A$2235$X in batch $765235$ with $500$GB that is sold by BestBuy.

Write each of the following dependencies as an FD:

a$.$ The manufacturer and serial number uniquely iden$8$fies the disk drive and its features

b$.$ A model number is registered by a manufacturer and hence can$$t be used by another manufacturer.

c$.$ All disk drives in a par$8$cular batch are the same model.

d$.$ All disk drives of a par$8$cular model of a par$8$cular manufacturer have exactly the same capacity.