Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to make a computer operating system [title] Learn programming before you begin. [step] Assembly language is essential; another supplementary high level language such as c is strongly recommended. [title] Decide what media you want to load your os on.

Ending1: [step] It can be a cd drive, dvd drive, flash drive, a hard disk, a floppy disk, or another pc. [title] Decide on your core idea of an os. Ending2: [step] Typically home programs do most of this. [title] Determine basic linux-based programs that allow you to build a virtual drive for your os instead of downloading the program at a mall or window store. Ending3: [step] A console operating system is the most common to be used in the game. To process data from linux, you need the visual format cd/dvd and the graphics jpeg. Ending4: [step] If you want to record your new library, then you may want to put all the data (the torrent files) into a jar with a finer paper layers before you are ready to go. With e-reader and hard disk space you must be able to quickly extract the data.

Answer format: ending1/ending2/ending3/ending4