Lol...the preferences where it's claimed are Al-Monitor..ever bothered to look? I just did..
This is how a credible source is...US DoD release approved by many nations.
Overview: Designated as a State Sponsor of Terrorism in 1984, Iran remained an active state sponsor of terrorism in 2011 and increased its terrorist-related activity, likely in an effort to exploit the uncertain political conditions resulting from the Arab Spring, as well as in response to perceived increasing external pressure on Tehran. Iran also continued to provide financial, material, and logistical support for terrorist and militant groups throughout the Middle East and Central Asia. Iran was known to use the Islamic Revolutionary Guard Corps-Qods Force (IRGC-QF) and terrorist insurgent groups to implement its foreign policy goals, provide cover for intelligence operations, and support terrorist and militant groups. The IRGC-QF is the regime's primary mechanism for cultivating and supporting terrorists abroad.
In 2011, the United States discovered that elements of the Iranian regime had conceived and funded a plot to assassinate Saudi Arabia's Ambassador to the United States in Washington D.C. Mansour Arbabsiar, an Iranian-born U.S. dual-national working on behalf of the IRGC-QF, was arrested in September 2011 for his role in the plot; also indicted in the case was an IRGC-QF officer who remains at large. Arbabsiar held several meetings with an associate whom Iranian officials believed was a narcotics cartel member. This associate, in fact, was a confidential source for U.S. law enforcement. The thwarted plot underscored anew Iran's interest in using international terrorism – including in the United States – to further its foreign policy goals.
Despite its pledge to support the stabilization of Iraq, Iran continued to provide lethal support, including weapons, training, funding, and guidance, to Iraqi Shia militant groups targeting U.S. and Iraqi forces, as well as civilians. Iran was responsible for the increase of lethal attacks on U.S. forces and provided militants with the capability to assemble explosives designed to defeat armored vehicles. The IRGC-QF, in concert with Lebanese Hizballah, provided training outside of Iraq as well as advisors inside Iraq for Shia militants in the construction and use of sophisticated improvised explosive device technology and other advanced weaponry