Determine whether the following set is finite or infinite:
The set of positive integers greater than $100$.

State whether the following set is finite or infinite:
The set of numbers which are multiples of $5$.

Examine whether the following statement is true or false:
$\{a\} \in \{a, b, c\}$

List all the elements of the following set:
$F = \{ x : x \text{ is a consonant in the English alphabet which precedes } k \}$

Make correct statements by filling in the symbols $\subset$ or $\not\subset$ in the blank spaces:
${ x:x \text{ is a triangle in a plane} } \dots { x:x \text{ is a rectangle in the plane} }$

List all the elements of the following set:
$D = \{ x : x \text{ is a letter in the word } \text{"LOYAL"} \}$