Graph, if shifted how much, and which way ?

Transformation of Periodic Functions [cos(x)]

For horizontal shifting:  +c (left)      -c (right)
For vertical shifting:      +d (up)      -d (down)

For horizontal scaling (period):        b↑   compressing      b↓  stretching
For vertical scaling (amplitude):      a>1  stretching          0<a<1 compressing

Refer to the chart I attached

I hope that helps!

I am with you if you faced any difficulties!

Iknow one of the answers is a and maybe b but not 100% sure about b