For triangle ABC, line AC≅ line AB. Which set of measures is possible for angle CAB and angle CBA? (All angles look like acutes in the picture(isosceles triangle)) 1: m∠CAB=45∘, m∠CBA=90∘
2: m∠CAB=20∘, m∠CBA=60∘
3: m∠CAB=30∘, m∠CBA=30∘
4: m∠CAB=25∘, m∠CBA=35∘