What is the scientific stance on the existence of a multiverse, according to current theories and research?
a) The multiverse is a widely accepted scientific fact with substantial empirical evidence supporting its existence.
b) The multiverse is a theoretical concept proposed by some scientists, but there is no direct empirical evidence confirming its existence.
c) The multiverse theory is considered disproven by the majority of the scientific community.
d) The concept of a multiverse is purely fictional and has no basis in scientific theory or research.