What type of network is used for an online bank (E-Banking) or in other words an online banking company?

Example of online banking companies like Chime, Ally, Nerd Wallet

 

• Personal Area Network (PAN)
• Local Area Network (LAN)
• Wireless Local Area Network (WLAN)
• Wide Area Network (WAN)
• Campus Area Network (CAN)
• Metropolitan Area Network (MAN)
• Storage Area Network (SAN)
• System Area Network (also known as SAN)
• Passive Optical Local Area Network (POLAN)
• Enterprise Private Network (EPN)
• Virtual Private Network (VPN)

 

I would assume it would be a Wide Area Network but not too sure because it's for an online bank.