Explanation
The correct option is (a) ROM.
Detailed Explanation
ROM (Read-Only Memory): This is a type of non-volatile memory, meaning it permanently stores data even when the computer is powered down. When you turn on a computer, it relies on critical start-up instructions (like the BIOS or firmware) stored in ROM to boot up the system. These instructions are permanently written during manufacturing and cannot be easily modified or altered by normal computer programs.
RAM (Random Access Memory) & SRAM (Static RAM): These are volatile memories. They only hold temporary data while the system is powered on, and their contents are wiped clean immediately when power is lost.
ALU (Arithmetic Logic Unit): This is a component of the CPU responsible for performing mathematical calculations and logical operations, not a storage memory.
We can mathematically represent the permanent availability of data content C in ROM as a constant value over time t, irrespective of the system power state P(t):
CROM(t)=Constant
P(t)∈{0,1}
Since the instructions are hardwired and static, the probability P of data alteration under normal operating conditions is zero:
P(Alteration)=0
