When you do external calls to other smart contracts:
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.
C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.

Question

Quizplus · Accepted Answer

The checks-effects-interactions pattern helps prevent reentrancy attacks by ensuring that state changes are made before external calls, reducing the risk of unexpected contract behavior.

When You Do External Calls to Other Smart Contracts