Mission statement

The question from the practice kits on accaglobal show like this Which of the following about mission statement are true 1- they are stated in a standard format 2- they plan an important role in the planning process 3- they help ensure consistency in decisions making A- 2 only B - 1 only C- 1,2,3 D- 2 and 3 In the answer , it showed D ( 2 and 3) , But I've chosen option A (2 ) . As option 3, they missed " goal cogurence " in the phrase . And I saw other questions from other papers . When it's 1/2 correct means it's incorrect ? Thanks Mr John