Allowing for the overall limitation $(50\%$ reduction for meals$),$ which of the following trips, if any, will qualify for the travel expense deduction?

Group of answer choices

Dr$.$ Jones, a self$-$employed general dentist, attends a two$-$day seminar on developing a dental practice.

Dr$.$ Brown, a$$self$-$employed$$surgeon$,$ attends a two$-$day seminar on financial planning.

Paul, a romance language high school teacher, spends summer break in France, Portugal, and Spain improving his language skills.

Myrna went on a two$-$week vacation in Boston. While there, she visited her employer$$s home office to have lunch with former co$-$workers.

All of these.