Pick up the correct statement from the following:
(A) Earliest expected time is denoted by TE
(B) Latest occurrence time is denoted by TL
(C) Contractual obligation time is denoted by Ts
(D) All the above
(A) Earliest expected time is denoted by TE
(B) Latest occurrence time is denoted by TL
(C) Contractual obligation time is denoted by Ts
(D) All the above