A cloud$-$based software provider has a $3-$stage funnel, presented below, outlining the expected path from website visitor to paying customer. Which funnel would help determine a "drop$-$off $"$ point, or stage at which visitors tend to abandon the online journey instead of becoming customers?

Review subscription options and pricing page

Input payment information on $30-$day free trial enrollment page

Confirm paid subscription when free trial period ends

a$.$

Strict funnel

b$.$

Flexible funnel

c$.$

Exclusion funnel

d$.$

Deviation funnel