Which of the following is correct method to add a success button?

सक्सेस बटन जोड़ने के लिए निम्नलिखित में से कौन सा सही तरीका है?

<button class = " w3-button w3-green"> success </button>

<button class = "btn w3-success"> success </button>

<button class = "button w3-success"> success </button>

<button class = "w3-button w3-primary"> success </button>

Explanation: