Step 1: Defining robbery.
According to IPC, robbery is an aggravated form of theft or extortion involving violence or threat.
Step 2: Analysis of options.
- Robbery: Correct, covers theft and extortion.
- Dacoity: Robbery by 5 or more persons.
- Criminal breach of trust: Misappropriation, not theft/extortion.
- Receiving stolen property: Different offence.
Step 3: Conclusion.
Therefore, robbery is defined as either theft or extortion.