Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to make an mp3 file [title] Download and install [http: // audacity. Sourceforge. Net audacity], an open-source audio editing program. [step] This program will be useful later for converting a raw audio source file into the mp3 file format. [title] Locate the microphone input for your computer.

Ending1: [step] If the input is on a usb phone or portable transmitter, it will be located on the top of the usb (component) list. An external microphone input is dependent upon the type of computer you are using. Ending2: [step] The input input will help you convert the files into mp3 files. This input input is usually found on the back of the computer. Ending3: [step] The microphone input feature will be installed, and your open source audio output output output will be displayed. [substeps] You can also download and install the software from www.mpz. Ending4: [step] Most laptops will have a microphone built into the system by default and locating it is just a matter of reading the manual. For desktop computers, however, it is unlikely that a microphone will be built into it.

Answer format: ending1/ending2/ending3/ending4