How do you spell Attesting

Available Definitions:
1)  v. t. - To bear witness to; to certify; to affirm to be true or genuine; as, to attest the truth of a writing, a copy of record.
2)  v. t. - To give proof of; to manifest; as, the ruins of Palmyra attest its ancient magnificence.
3)  v. t. - To call to witness; to invoke.
4)  n. - Witness; testimony; attestation.