to show end of a sentence

After abbreviations or short forms

Both a and b

indicate a pause in sentence

to separate items when listing more than two items in a row

Both a and b

indicate end of a sentence or expressing strong feeling

indicate end of a word or expressing strong feeling

Both a & b

None of these

to show that something belongs to someone eg Deepak's

to indicate the shortened form of some words as in isn't or don't

None of these

Both of these