At the end of the code below, num is num=0
letters-"ABCDEFGHIJKLMNOPORSTUVWXYZ "
For a in "Hello World!!!
if a not in letters:
num+=1

Barbara is interested in pursuing a career in the science and math pathway. which qualifications will her reach that goal? a.an advanced knowledge of physics and math b.an advanced knowledge of engineering and math c. an advanced knowledge of physics and robotics an d. advanced knowledge of machinery and math