What is the rhyme scheme in this excerpt from the poem “the voice” by thomas hardy?

can it be you that i hear? let me view you, then,
standing as when i drew near to the town
where you would wait for me: yes, as i knew you then,
even to the original air-blue gown!

or is it only the breeze, in its listlessness
travelling across the wet mead to me here,
you being ever dissolved to wan wistlessness,
heard no more again far or near?

thus i; faltering forward,
leaves around me falling,
wind oozing thin through the thorn from norward,
and the woman calling.

a) aabb
b) abab
c) abba
d) abca