Ultrasonic machine (USM) disadvantages

Question

Consider the following machining disadvantages:

1. Low metal removal rate

2. Poor surface finish

3.  High tooling cost

Which of these disadvantages are associated with ultrasonic machine (USM)?

 (a) 1 and 3      (b) 1 and 2       (c) 2 and 3        (d) 1, 2 and 3