Consider the following work breakdown structure:

$\backslash$table$[[,,$Time Estimates$],[,,$days$),,],[$Activity$,$Precedes,Optimistic,Most Likely,Pessimistic$],[$Start$,$A$,$ B$,$C$,-,-,-],[$A$,$D$,38,50,62],[$B$,$E$,90,99,108],[$C$,$End,$85,100,115],[$D$,$F$,19,25,31],[$E$,$End,$91,100,115],[$F$,$End,$62,65,68]]$

What is the estimated slack time for activity $A?$

Multiple Choice

$60$ days