Quiz: searching and editing text

One correct answer

app.conf has two lines: listen=8080 and # old listen=8080. What will sed '/^listen=/s/8080/9090/' app.conf print?

• A listen=9090 and # old listen=8080
• B Nothing — with an address sed prints nothing.
• C listen=9090 and # old listen=9090
• D One line, listen=9090 — sed skips the comment.