Oswald Odd consumes only goods 1 and 2. His utility function is U(x1; x2) = x1 +x2 + min{x1, x2}. Each of Oswald's indifference curves is:
(a) L-shaped.
(b) made up of 3 line segments with slopes -2, -1, and -1/2.
(c) made up of two line segments with slopes -2 and -1/2.
(d) is smooth and has no kinks.
(e) is a diamond-shaped figure consisting of 4 line segments