Where is the operating system of a Raspberry Pi stored?

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C. On a removable SD card which is put into the Raspberry Pi. The Raspberry Pi was designed without built-in persistent flash storage, so it relies on a removable microSD card to store the bootloader, kernel, and full operating system. This design choice keeps the hardware cost low and makes it easy to swap operating systems simply by swapping cards. The Raspberry Pi firmware reads the boot files (bootcode.bin, config.txt, etc.) directly from the FAT partition on the SD card at startup.

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A. On the master device attached to the Raspberry Pi's IDE bus. The Raspberry Pi does not have an IDE bus; it uses GPIO, USB, and CSI/DSI interfaces, none of which function as IDE storage.

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B. On a read only partition on the Raspberry Pi's firmware, next to the BIOS. The Raspberry Pi has a small onboard EEPROM/firmware chip for the bootloader stage but the full OS is not stored there; it has no BIOS partition containing the OS.

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D. On a Linux extension module connected to the Raspberry Pi's GPIO pins. GPIO pins are a general-purpose input/output interface for connecting sensors and peripherals, not a storage medium for an operating system.

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E. On rewritable flash storage which is built into the Raspberry Pi. Standard Raspberry Pi models do not include built-in rewritable eMMC flash storage; that is a feature found on the Compute Module variants, not the standard Pi boards.

Where is the operating system of a Raspberry Pi stored?

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