In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Question: After antigenic recognition, the T cell receptor transmits an activation signal through:
Options: <1> CD3 and chain . <2> Ig and Ig. <3> TAP1 and TAP2. <4> RAG1 and RAG2. <5> Determining regions of complementarity 1 and 2.
1