What can a security analyst do to identify an attack if an iFrame injection is missed by visual observation (by only showing a few pixels)?

What can a security analyst do to identify an attack if an iFrame injection is missed by visual observation (by only showing a few pixels)?
A . run the webpage in a sandbox environment
B . review a packet capture through Wireshark
C . observe the traffic on the website
D . run an NMAP scan on a user’s web traffic

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Answer: B