The # in the above lines of code represents:

कोड की उपरोक्त पंक्तियों में # दर्शाता है:

<style>
#myHeader {
background-color: lightblue;
color: black;
padding: 40px;
text-align: center;
}
</style>

an id tag

class name

an universal tag

horizontal frame

Explanation:

In the given code, the # symbol is used to select an ID in CSS.

#myHeader {
  background-color: lightblue;
  color: black;
  padding: 40px;
  text-align: center;
}

Here, #myHeader refers to an HTML element with the id="myHeader". In CSS, the # symbol is used to target elements by their ID.

So, the correct answer is:

(A) an id tag.