Strategic Arms Limitation Talks - SALT (I) was signed by:

Richard Nixon and Leonid Brezhnev

The correct answer is option (2) - Richard Nixon and Leonid Brezhnev

STRATEGIC ARMS LIMITATION TALKS I (SALT-I): The first round of the Strategic Arms Limitation Talks began in November 1969. The Soviet leader Leonid Brezhnev and the US President Richard Nixon signed the following in Moscow on 26 May 1972 – a) Treaty on the limitation of Anti-Ballistic Missile Systems (ABM Treaty); and b) Interim Agreement on the limitation of strategic offensive arms. Entered into force on 3 October 1972.

STRATEGIC ARMS LIMITATION TALKS II (SALT-II): The second round started in November 1972. The US President Jimmy Carter and the Soviet leader Leonid Brezhnev signed the Treaty on the limitation of strategic offensive arms in Vienna on 18 June 1979.