Figure $3($Problem $3$ & $4)-3.$ Refer to Figure $3.$ Which is not true about the PDM for the project? Select the most appropriate one.

a$.$ The late start of Activity A is $1.$

b$.$ The early start of Activity B is $5.$

c$.$ The late finish of Activity C is $6.$

d$.$ The late start of Activity D $7.$

$4.$ Refer to Figure $3.$ Which is not true about the PDM for the project? Select the most appropriate one.

a$.$ The project duration is $9.$

b$.$ The total float of C is $0.$

c$.$ The free float of B is $0.$

d$.$ None of the above is true.