The name of Israel’s Air Defence System is ________.

Concept: An air-defence system is identified by the programme that builds and fields it. Every such programme belongs to a specific country and covers a specific interception layer — short-range rockets and artillery shells, medium-range missiles, or long-range ballistic threats. Naming a country's air-defence system therefore means matching a programme name to its developer nation and to the threat envelope it was built for.

Application: Israel fields a layered architecture. Its short-range layer, developed by Rafael Advanced Defense Systems together with Israel Aerospace Industries and operational since 2011, is the Iron Dome, which intercepts rockets and artillery shells fired from roughly 4 km to 70 km away. Above that layer sit David's Sling against medium-range missiles and the Arrow series against ballistic missiles, so the Iron Dome is the name attached to Israel's rocket-defence layer.

Contrast with the other names given:

• S 400 Defence System — a long-range surface-to-air missile system from the Russian design bureau Almaz-Antey (NATO reporting name SA-21 Growler), fielded from 2007 and exported to states such as China, India and Turkey; it is a Russian programme, not an Israeli one.

• Pink Dome — no national air-defence inventory records a programme under this designation.

• Wing Dome — a wing is an air-force formation of several squadrons; it is not the name of any interceptor programme.

Cross-check: of the four names given, the one belonging to an Israeli air-defence programme is the Iron Dome, the system routinely cited for intercepting short-range rockets fired at Israeli territory.