What is the address size for IPv6 addresses?

What is the address size for IPv6 addresses?

• 128 bit
• 32 bit
• 64 bit
• 256 bit 

EXPLANATION

Internet Protocol version 6 is the most recent version of the Internet Protocol, the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet.
IPv6 addresses are 128-bit IP address written in hexadecimal and separated by colons. An example IPv6 address could be written like this: 3ffe:1900:4545:3:200:f8ff:fe21:67cf.