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When transaction $Ti$ requests a data item currently held by $Tj,Ti$ is allowed to wait only if it has a timestamp smaller than that of $Tj$ (that is $Ti$ is order than Tj). Otherwise, $Ti$ is rolled back (dies). This is

  1. Wait-die
  2. Wait-wound
  3. Wound-wait
  4. Wait
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The question is the definition of Wait-die scheme which goes as follows:  " When transaction Ti requests a data item currently held by Tj, Ti is allowed to wait only if it has a timestamp smaller than that of Tj (That is Ti is older than Tj), otherwise Ti is rolled back (dies)"

Reference: Wound-wait and Wait-die Schemes

Option A is correct

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This scheme is known as WAIT DIE..Hence the option A is correct.
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ANS : A  (WAIT DIE )

When transaction Ti requests a data item currently held by Tj, Ti is allowed to wait only if it has a timestamp smaller than that of Tj (That is Ti is older than Tj), otherwise Ti is rolled back (dies)"
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