What does a zero-degree contact angle between an adhesive and an adherent signify?

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The surfaces are fully wettedThe adhesive and adherent surfaces are roughMolecules of adhesive and adherent are just touchingThere are surface irregularities on the adherent

Explanation

A zero-degree contact angle indicates that the adhesive completely wets the adherent surface, meaning the adhesive spreads fully without forming droplets. This results in maximum surface contact between the two materials.