I work 5 years under term contract? They send me email to sign amended part of the contract?

Should I sign it hence they extended only my employment up to June 30, 2016 or:Should I sign it hence they extended only my employment up to June 30,

Should I sign it hence they extended only my employment up to June 30, 2016

or:Should I sign it hence they extended only my employment up to June 30, 2016

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