Choose the correct JavaScript syntax to change the content of the following HTML code.
a) document.getElement ("letsfindcourse").innerHTML = "I am a letsfindcourse";
b) document.getElementById ("letsfindcourse").innerHTML = "I am a letsfindcourse";
c) document.getId ("letsfindcourse") = "I am a letsfindcourse";
d) document.getElementById ("letsfindcourse").innerHTML = I am a letsfindcourse;