Among the following options,identify the element which exhibits the greatest number of oxidation states.

The transition metal used in $X$-ray tubes is:

Identify the correct decreasing order of atomic size from the following.

The element with the highest standard reduction potential (in volt) for the process $M^{2+} \rightarrow M$ among the first row of transition elements is:

Assertion : $E^o$ for $Mn^{3+}/Mn^{2+}$ is more positive than $Cr^{3+}/Cr^{2+}$.
Reason : The third ionization energy of $Mn$ is larger than that of $Cr$.

Match the elements in List-$I$ with their electronic configurations in List-$II$.

List-$I$	List-$II$
$(1)$ $Ti^+$	$(A)$ $(n-1)d^4ns^2$
$(2)$ $_{30}Zn$	$(B)$ $(n-1)d^{10}ns^1$
$(3)$ $_{24}Cr$	$(C)$ $(n-1)d^2ns^0$
$(4)$ $_{29}Cu$	$(D)$ $(n-1)d^5ns^1$
	$(E)$ $(n-1)d^0ns^2$
	$(F)$ $(n-1)d^{10}ns^2$