The length of the perpendicular form the origin to the plane passing through the point `a` and containing the line ` vec r= vec b+lambda vec c` is a. `([ vec a vec b vec c])/(| vec axx vec b+ vec bxx vec c+ vec cxx vec a|)` b. `([ vec a vec b vec c])/(| vec axx vec b+ vec bxx vec c|)` c. `([ vec a vec b vec c])/(| vec bxx vec c+ vec cxx vec a|)` d. `([ vec a vec b vec c])/(| vec cxx vec a+ vec axx vec b|)`