Answer
$(a)$, $(b)$
Work Step by Step
The SI unit of Magnetic Flux is Weber (Wb), as outlined by the General Conference on Weights and Measures (CGPM, Conférence Générale des Poids et Mesures).
Additionally, the unit for Magnetic flux can also be expressed in $T\cdot m^2$ because Magnetic flux is defined as the total magnetic field that passes through a given area. Hence one Weber is the total magnetic field, expressed in units Tesla $T$ multiplied by the area through which is passes which is expressed by $m^2$.
Thus, $1Wb=T\cdot m^2$, hence why option $(b)$ is also right.
