Abaker has her hand-mixer set to high to mix a cake batter. she can turn it down to low or turn it off. which best describes what she did during the time shown on the graph?

a. after 30 seconds, she turned it down to low for 30 seconds. she then turned it off.

b. after 60 seconds, she turned it down to low for 60 seconds. she turned it back to high for 30 seconds, then turned it off.

c. after 30 seconds, she turned it down to low for 30 seconds. she turned it back to high for 60 seconds, then turned it off.

d. after 60 seconds, she turned it down to low for 60 seconds. she then turned it off.