Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Type | Power\n[W] | Relative cost | Input range\n[V] | Energy storage | Features |
| --- | --- | --- | --- | --- | --- |
| Flyback | 0–250 | 1.0 | 5–600 | Mutual Inductors | Isolated form of the buck-boost converter. |
| Ringing choke converter (RCC) | 0–150 | 1.0 | 5–600 | Transformer | Low-cost self-oscillating flyback variant. |
| Half-forward | 0–250 | 1.2 | 5–500 | Inductor |  |
| Forward | 100-200 |  | 60–200 | Inductor | Isolated form of buck converter |
| Resonant forward | 0–60 | 1.0 | 60–400 | Inductor and capacitor | Single rail input, unregulated output, high efficiency, low EMI. |
| Push-pull | 100–1,000 | 1.75 | 50–1,000 | Inductor |  |
| Half-bridge | 0–2,000 | 1.9 | 50–1,000 | Inductor |  |
| Full-bridge | 400–5,000 | >2.0 | 50–1,000 | Inductor | Very efficient use of transformer, used for highest powers. |
| Resonant, zero voltage switched | >1,000 | >2.0 |  | Inductor and capacitor |  |
| Isolated Ćuk |  |  |  | Two capacitors and two inductors |  |
Question:
the half-bridge's energy storage is not a transformer but what?
Answer:
Inductor