A popular forum, where ICS techniques are discussed, loads scripts and ads from multiple external sites. Which attack can an adversary use to leverage this situation to attack this particular industry

Password salting is a defensive technique for securely hashing stored credentials and is not an attack method at all.

Defacing involves modifying the visual content of a website directly and does not leverage external script or ad dependencies to compromise visitors.

A watering-hole attack works by compromising a third-party resource - such as an ad network or external script - that is loaded by a site the target community visits. Because ICS professionals frequent this forum and the forum pulls content from multiple external sources, an adversary can poison one of those sources to deliver malicious payloads specifically to that industry audience.

A DDoS attack floods a target with traffic to deny availability and does not exploit trusted third-party resources to deliver malicious code to specific users.