You were interrupted by a phone call while working on a data-mining project and dont recall exactly what you did just before the interruption. Glancing at the Weka output screen you can see the confusion matrix that appears in the box below. Then you recall what you were doing, and even know the algorithm you were using. What is the algorithm, and how do you know?

=== Confusion Matrix ===
a	b	c	d	e	f		<--	classified as
112	0	0	0	0	0	|	a	= 1
61	0	0	0	0	0	|	b	= 2
72	0	0	0	0	0	|	c	= 3
49	0	0	0	0	0	|	d	= 4
52	0	0	0	0	0	|	e	= 5
20	0	0	0	0	0	|	f	= 6