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Question #22 Difficulty: 2

According to the Solidity 0.8.17 compiler (200 optimization runs) 

    // What is the value of state variable x after calling Proxy.setX(3)?

contract C {
  address a;
  uint x;

  function setX(uint _x) external {
    x = _x;
  }
}

contract Proxy {

  address public a;
  uint public x;
  address c;

  constructor (address _c) {
    c = _c;
  }

  function setX(uint _x) external {
    (bool success,) = c.delegatecall(abi.encodeWithSignature("setX(uint256)", _x));
    require(success);
  }
}

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