Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to make concrete planters [title] 1-choose your molds. [step] You will need an outer mold and an inner mold of same shape but different size. [title] - the smaller mold should nestle inside the larger with a gap of about 2 inches or 5 cm.

Ending1: [step] If you use 3 or 4 molds and the inner has a gap of roughly 6 inches (15. 2 cm) it will not last long. Ending2: [title] - the outer molds should be the same size but bigger. [title] - press the inner molds in between the inner molds and press them firmly. Ending3: [step] The gap between molds will be the thickness of your planter's walls. If your planter will be any larger than 2 feet (0.6 m) by 2 feet (0.6 m), the walls should be 3 inches or 7.5 cm thick. Ending4: [title] - the molds are the most reliable size for building clay planters. [step] Ensure you have enough of them before proceeding.

Answer format: ending1/ending2/ending3/ending4