Which storage consideration applies when storing 1536-dimension float vectors?

1. ✓ A Each vector is roughly 6 KB, so plan storage and index memory accordingly (correct answer)
2. B Vectors are compressed automatically to 1 KB
3. C Dimension has no storage impact
4. D Vectors must be stored as JSONB

Shortcut: A vector(1536) holds 1536 four-byte floats plus overhead, around 6 KB per row. At millions of rows this dominates table size and index memory, so halfvec or dimensionality reduction is often used.