how to image responsive in bootstrap 4 code example

Example 1: how to make image responsive bootstrap 4

<img src="..." class="img-fluid" alt="Responsive image">

Example 2: responsive svg with bootstrap

<svg version="1.1" viewBox="0 0 500 500">
	<circle fill="#F7941E" stroke="#231F20" stroke-width="10" 
	cx="250" cy="250" r="200" opacity="0.6" />
</svg>