Which of the following equations represents a addition reaction?

مندرجہ ذیل میں سے کون سی مساوات اضافی ردعمل کی نمائندگی کرتی ہے؟

AB → A+B

A → AB

A+B → AB

AB → A+C

The equation A+B → AB represents an addition reaction, where two substances (A and B) combine to form a new compound (AB).