Which of the following utterances is a performative according to J.L. Austin's distinction, rather than a constative?

Question

Which of the following utterances is a  performative  according to J.L. Austin's distinction, rather than a constative?

Accepted Answer

I now pronounce you husband and wife.

Answer

Oh God, was I exhausted by the time I got home!

Answer

There were some fonts missing this morning.

Answer

The cat is on the mat.

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