Of the Following,which Are Disadvantages of Using Pocket Ionization Chambers

Of the following,which are disadvantages of using pocket ionization chambers as personnel dosimeters?
1) Mechanical shock causes pocket chambers to discharge.
2) A permanent legal record of personnel exposure cannot be obtained with a pocket dosimeter.
3) False high readings may be obtained if the pocket dosimeter is not read each day.

A) 1 only
B) 2 only
C) 3 only
D) 1,2,and 3