Which type of metal can be used in cathodic protection of iron against rusting.

Explanation

To determine which type of metal can be used in cathodic protection of iron against rusting, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Cathodic Protection**:
- Cathodic protection is an electrochemical method used to prevent the corrosion of iron. It involves coupling iron with another metal that is more reactive.

2. **Identify the Role of Metals**:
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