令和6年度 ITパスポート試験 問97

※ Our check while writing this explanation could not fully confirm the published answer; scoring follows IPA's official key.

• ×Incorrectア

  a (Android) and b (FreeBSD) are correctly OSS, but d (Linux), a representative example of OSS, is missing. Since the question asks to list all of those that are OSS, ア omits Linux and is therefore incomplete and wrong.

• ○イ

  正解 The correct answer is イ (a, b, d). OSS (Open Source Software) refers to software whose source code is published and that anyone is free to use, modify, and redistribute. Looking at the operating systems in the choices: Android (as AOSP, the Android Open Source Project), FreeBSD (under the BSD license), and Linux (under the GPL) each have their source code published and are representative examples of OSS. iOS, on the other hand, is Apple's own proprietary (closed-source) OS whose source code is not published. Therefore the ones provided as OSS are the three a, b, and d, and イ, which lists exactly all of them, is the correct answer.

• ×Incorrectウ

  b (FreeBSD) and d (Linux) are correctly OSS, but a (Android) is missing. Android is provided as OSS in the form of AOSP, so it must be included; thus ウ is incomplete and wrong.

• ×Incorrectエ

  d (Linux) is indeed OSS, but including c (iOS) is wrong. iOS is Apple's proprietary OS; its source code is closed and it is not OSS. In addition, a and b are also missing, making it inappropriate.