When Rama asked Hanuman "Who are you?".
Hanuman replied as follows:

When I identify myself with my body(Dehabuddhyad) I am
a servant of yours [This is Dvaita Bhava], when I
consider myself as an embodied soul(Jivabuddhyad) I am
a portion of yours [This Visishtadvaita Bhava] and
spiritually (Atmabuddhyad) I am yourself [This is
Advaita Bhava]. This is my firm belief!

deha-buddhyad tu daso'smi jiva-buddhyad tvadamsakah
atma-buddhyad tvamevaham iti me niscita matih