Select the sentence with correct punctuation for a list: 

1. The colors are: red blue and green
2. The colors are red, blue, and green
3. The colors are red, blue, and green
4. The colors are red blue, and green

Simple lists need commas between items, with an optional Oxford comma (APA 4.03). Colons (option a) only follow independent clauses. Option c lacks Oxford comma consistency; option d misses the first comma. Parallel structure is also key (all nouns or all verbs).