Select the correct answer.
What type of rhyme is used in this excerpt from William Butler Yeats's poem "The Municipal Gallery Revisited"?

My mediaeval knees lack health until they bend,
But in that woman, in that household where
Honour had lived so long, all lacking found.
Childless I thought, 'My children may find here
Deep-rooted things,' but never foresaw its end,
And now that end has come I have not wept;
No fox can foul the lair the badger swept --