令和2年度 ITパスポート試験問92

This question's explanation and your answers so far.

問92

頻出度★★★

A さんが X さん宛ての電子メールを送るときに, 参考までに Y さんと Z さんにも送ることにした。ただし, Z さんに送ったことは, X さんと Y さんには知られたくない。このときに指定する宛先として, 適切な組合せはどれか。

	To	Cc	Bcc
ア	X	Y	Z

	To	Cc	Bcc
イ	X	Y，Z	Z

	To	Cc	Bcc
ウ	X	Z	Y

	To	Cc	Bcc
エ	X，Y，Z	Y	Z

出典　令和2年度 ITパスポート試験問92

解説

問 92

ア
正解 The recipient fields of an email are used in three ways: To (the main recipient), Cc (recipients sent a copy for reference, also visible to the other recipients), and Bcc (recipients whose inclusion is not revealed to the other recipients). In this question, the main party X is placed in “To”, and Y, who is sent a reference copy, is placed in “Cc”. A also wants to send a reference copy to Z, but does not want X and Y to know that it was sent to Z, so Z is placed in “Bcc”, where the address is not visible to the other recipients. Therefore the combination To = X, Cc = Y, Bcc = Z is correct, and choice ア is appropriate.
Incorrectイ
This puts both Y and Z in Cc. Cc recipients are visible to all other recipients, so X and Y would learn that it was sent to Z, violating the condition that A does not want it known that it was sent to Z.
Incorrectウ
This puts Z in Cc and Y in Bcc. Since Cc is visible, X would learn that it was sent to Z, violating the condition. In addition, Y, who should simply be sent a normal reference copy, is deliberately placed in Bcc where others cannot see it, so the intent of the assignment is also reversed.
Incorrectエ
This puts X, Y, and Z all together in To. To recipients are visible to all recipients, so X and Y would learn that it was sent to Z, violating the condition that A does not want it known that it was sent to Z.

ここがポイント

Distinguishing To, Cc, and Bcc. To is the main recipient; Cc (carbon copy) is for sharing a reference copy and is visible to the other recipients as well.
With Bcc (blind carbon copy), that recipient address is not revealed to the other recipients. A party whose inclusion you want to hide should be placed in Bcc.

用語

解答問92ア