Multiple extensions when applied @extend in SASS

Another interesting feature of using the @extend directive is that you can extend a single selector with more than one selector, i.e. it will inherit all styles:

Let's look at an example:

.warning {
	border: 1px solid;
	background-color: rgb(255, 217, 0);
}
.info {
	font-size: 14px;
}
.personalWarning {
	@extend .warning;
	@extend .info;
	border-width: 3px;
}

As a result of compilation we will get:

.warning, .personalWarning {
	border: 1px solid;
	background-color: #ffd900;
}
.info, .personalWarning {
	font-size: 14px;
}
.personalWarning {
	border-width: 3px;
}

It is important to know that multiple extensions can be written as a comma-separated list of selectors. For example, @extend .warning, .info; means the same as @extend .warning; @extend .info;

Tell me what the result of compiling the following code will be:

link {
	font-size: 12px;
	background-color: #ffd900;
}
button:active {
	color: red;
}
.active-link {
	@extend link;
	@extend button:active;
	text-decoration: wavy;
}

Tell me what the result of compiling the following code will be:

div {
	font-size: 10px;
	color: #181402;
}

.main-block {
	border: 2px solid orange;
}

p {
	padding: 5px;
}

#warning-text {
	@extend div, .main-block, p;
	margin-top: 10px;
}