Final answer:
All the statements about rip currents provided are true, describing their nature, formation, and where their force diminishes.
Step-by-step explanation:
The statement that rip currents are a narrow flow of swiftly moving water that runs perpendicular to the shore is true. Furthermore, rip currents do form when water flowing back out to sea is funneled through a narrow space, often between two sandbars or a break in a coral reef.
Lastly, the force of a rip current indeed diminishes in deeper water, typically not far beyond the surf zone. Therefore, all of the provided statements are correct.