You are designing a page in which all the headings are to be in a red font color.

You can add this styling rule by using a $\_\_\_\_\_\_\_\_\_\_$ to separate each heading tag and apply the red font color under a single styling rule.

a$.)$

comma $(,)$

b$.)$

greater than symbol $(>)$

c$.)$

tilde $($~$)$

d$.)$

plus symbol $(+)$