Final answer:
The molecule AX2E4 has a total of six electron domains, which includes two bonding pairs and four lone pairs of electrons.
Step-by-step explanation:
The molecule with the formula AX2E4 indicates a central atom 'A' with two bonded atoms 'X' and four lone pairs of electrons 'E'. The question asks for the total number of electron domains, which includes both bonding pairs and lone pairs. In this molecule, there are two bonding pairs from AX and four lone pairs E, which give us a total of 2 + 4, equaling six electron domains. Therefore, the correct answer is 3) 6 electron domains for the molecule AX2E4.