Which of the following best describes a public cloud model?

a$.$ The cloud infrastructure is owned and operated by a third$-$party provider and is available to a select group of trusted partners

b$.$ The cloud infrastructure is owned and operated by a third$-$party provider and is available to the general public

c$.$ The cloud infrastructure is owned and operated by the customer

d$.$ The cloud infrastructure is owned and operated by a third$-$party provifer and is only available to a specific organization or group of users