For applying the filter you need to select the data on which you want to apply it so it will allow you to look at only data you select from the filter options.
Answer: Computer memory is of two basic type – Primary memory(RAM and ROM) and Secondary memory(hard drive,CD,etc.). Random Access Memory (RAM) is primary-volatile memory and Read Only Memory (ROM) is primary-non-volatile memory.
Explanation: Hope this helps :)
