Which shortcut is used to indicate the date of a month from now?

The correct shortcut to indicate the date of a month from now is associated with adding to the month representation, which is effectively accomplished with "M + 1." This notation signifies that you want to advance from the current month to the corresponding same date in the subsequent month.

For instance, if today is January 15 and you use "M + 1," you're indicating the desire to have the date as February 15. This association with the letter "M" specifically relates to the months of a calendar, making it intuitive for tracking changes in time on a monthly basis.

The other options use differing representations or increments—adding two months or days, which would not effectively reflect a singular month’s progression.