Which of the following R functions is used to calculate the exact left-tail probability for a 
distribution?
Definitions:
Customer Benefit Approach
A sales strategy focusing on highlighting the advantages and improvements a product or service can bring to a customer's life or business.
Unique Gift
A special and one-of-a-kind present designed to surprise or please someone.
Gratitude
The feeling of thankfulness or appreciation, often expressed towards others for help received, kindness, or meaningful gestures.
Water-Repellant
A property or characteristic of materials that resist the penetration of water, often used in clothing, footwear, and outdoor gear.
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