平成29年度秋期 ITパスポート試験問79

This question's explanation and your answers so far.

問79

頻出度★★★

A さんは次の送信先を指定して電子メールを送信した。この電子メールの受信者が知ることのできる情報の説明として，適切なものはどれか。〔送信先〕 To：Bさん，Cさん　Cc：Dさん　Bcc：Eさん，Fさん

出典　平成29年度秋期 ITパスポート試験問79

解説

問 79

Incorrectア
B is a To recipient, but E is a Bcc address. Since an address placed in Bcc is not shown to recipients other than the sender, B cannot know that the email was also sent to E.
イ
正解 In email, the addresses listed in To and Cc are delivered so that everyone who receives the email can see them. A Bcc address, on the other hand, is known only to the sender and is never shown to the other recipients. In this question, To is B and C, Cc is D, and Bcc is E and F. Choice イ states that “C can know that the same email was also sent to B and D”; since C is a To recipient, and both B (also in To) and D (in Cc) are disclosed addresses, they appear directly on C's screen. Therefore イ is correct.
Incorrectウ
D is a Cc recipient, but E is a Bcc address. Even a Cc recipient cannot see Bcc addresses, so D cannot know that the email was also sent to E.
Incorrectエ
E is a Bcc recipient. C, in To, is a disclosed address, so E can see it; but F is likewise a Bcc address, and Bcc recipients cannot know one another's addresses. Therefore E cannot know that the email was also sent to F, so the statement that E can learn about “both C and F” is incorrect.

ここがポイント

Addresses placed in To and Cc are disclosed to all recipients, but addresses placed in Bcc are not shown to anyone other than the sender (Bcc recipients cannot even know one another).
The approach of judging the answer by organizing each recipient's “visible scope” according to the type of address field.

用語

解答問79イ