The given options in the question are:
a) PROM
b) EPROM
c) CD ROM
d) ROM
e) EEPROM

To determine the group and the odd one out, we need to identify the common characteristic or property shared by four of the options.

The terms in the question are related to computer memory and storage. Let's analyze each option to understand their meanings and functions:

a) PROM stands for Programmable Read-Only Memory. It is a type of non-volatile memory that can be programmed only once by the manufacturer or user. The stored data in PROM cannot be modified or erased.

b) EPROM stands for Erasable Programmable Read-Only Memory. It is also a type of non-volatile memory, but unlike PROM, it can be erased and reprogrammed multiple times. EPROM requires exposure to ultraviolet light for erasing the data.

c) CD ROM stands for Compact Disc Read-Only Memory. It refers to the optical disc format used for storing digital data. CD-ROMs are read-only, meaning the data on them cannot be modified or erased. They are primarily used for distributing software, games, and multimedia content.

d) ROM stands for Read-Only Memory, and it is a type of non-volatile memory that stores data permanently. The data in ROM is programmed during manufacturing and cannot be modified or erased by the user.

e) EEPROM stands for Electrically Erasable Programmable Read-Only Memory. It is a type of non-volatile memory that can be erased and reprogrammed electrically. Unlike EPROM, EEPROM does not require exposure to ultraviolet light for erasing.

Analyzing the options, we can see that four of them (a, b, d, e) are types of programmable memory that can be modified or erased in some way. Meanwhile, option c (CD ROM) is a read-only memory format that cannot be modified or erased. Therefore, option c (CD ROM) does not belong to the group.

In summary:
- PROM, EPROM, ROM, and EEPROM are all types of programmable memory that can be modified or erased.
- CD ROM is a read-only memory format that cannot be modified or erased.

Hence, the correct answer is option 'C' (CD ROM) as it does not belong to the group of programmable memories.