What is the purpose of an initramfs during the Linux system start?

What is the purpose of an initramfs during the Linux system start?
A . It loads required modules and starts sub sytems like LVM to make the root file system accessible to the kernel
B . It moves the kernel from normal system memory to initram memory to speed up kernel access
C . It copies the root file system’s content to RAM to speed up the system and reduce writes to disk
D . It creates a ram disk to store volatile data for directories like /tmp to reduce writes to disk

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Answer: A