please help me to solve it

A computer runs a 32-bits version of Windows 7 Ultimate. You are required to upgrade that computer to a 64 bits of Win 8 to that computer There is no dual boot option Which one is not a correct step in the process?

a. Delete each partion on the harddisk from the installation option

b. Using Windows Explorer, run the setup program from the Windows 8 installation media

c. Choose the Custom installation option

d. Boot the computer with the Win 8 installation DVD