•this froze the number of strategic ballistic missile launchers at existing levels
• it provided for the addition of new submarine launch ballistic missiles only after an equal number of obsolete weapons were dismantled or destroyed
• negotiations lasted from november 17, 1969 until may 1972, ending when richard nixon and leon and per negotiations lasted from november 17, 1969 until may 1972, ending when richard nixon and leonid brezhnev signed the anti-ballistic missile treaty

question: which set of cold war negotiations is being described by these statements

a-start i
b-salt ii
c-salt i
d-start ii