You are incorrect - our patient's acoustic events at the apex include a plateau-shaped holosystolic murmur + S3 + mid diastolic murmur.
Your choice: Systolic plateau-shaped murmur + mid diastolic murmur
This is a graphic example of a systolic plateau-shaped murmur and a mid diastolic murmur. Note that the systolic murmur is high frequency and the diastolic murmur is low frequency.