For triangle ABC, what type of angle is:
a)∠ABC?
b)∠BCA?
c)∠CAB?
A)a) Acute angle, b) Obtuse angle, c) Right angle
B)a) Right angle, b) Obtuse angle, c) Acute angle
C)a) Obtuse angle, b) Acute angle, c) Right angle
D)a) Acute angle, b) Right angle, c) Obtuse angle